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<!-- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> -->
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<div id="post-617" class="hentry p1 post publish author-admin category-cojson y2015 m10 d19 h05">
<h2 class="entry-title">cojson tutorial v2.0</h2>
<div class="entry-content">
<h3>1. Getting Started</h3>
<p>For a quick start the easiest way is using <a href="https://hutorny.in.ua/codegen/cojson.html" target="_blank"><span class="term">codegen</span></a>.
Paste you <span class="term">JSON</span> into the left editor, hit button <span class="term">Run</span> and collect results in the right editor.
Adjust options if necessary and build with your application.</p>
<p>With instructions, given in this tutorial, you may manually craft or adjust auto-generated structure
of your <span class="term">JSON</span> object by mapping its elements to <span class="term">cojson</span> elements,
bind them to members of your C++ class (see <a href="#section-2">Section 2</a>),
implement the interfaces for the data streams you have, and build <span class="term">cojson</span> library
with your application (see <a href="#section-3">Section 3</a>).</p>
<span id="more-617"></span>
<p>The library provides implementation for parsing/serialization of basic types. However, your application is
not limited to those types only. You can add a reader/writer for your own type and use it with
<span class="term">cojson</span> (see <a href="#section-5.1">Sections 5.1, 5.2</a>). Also, if signatures of getters/setters
in your application do not match expected in <span class="term">cojson</span>, you may define your own accessor
with the signatures you have (see <a href="#section-5.3">Section 5.3</a>).</p>
<p>It worth to mention that <span class="term">cojson</span> neither provides nor allocates any data storage.
Instead your application binds the data storage to <span class="term">cojson</span> elements.</p>
<h3 id="section-2">2. Defining Model</h3>
<p><span class="term">JSON</span> model is defined as a hierarchy of template functions.
Parameters of these templates define <span class="term">JSON</span> member name, data type,
and the storage access method - a member pointer or getter/setter methods.
There are four groups of template functions each having its specific purpose and name:</p>
<table class="table functions">
<tr><th style="width:6em">V<...>()</th><td>Value...<...>()</td><td>Defines a generic value</td></tr>
<tr><th>M<...>()</th><td>Member...<...>()</td><td>Defines a member</td></tr>
<tr><th>O<...>()</th><td>Object...<...>()</td><td>Defines an object mapped to C++ class</td></tr>
<tr><th>P<...>()</th><td>Property...<...>()</td><td>Defines an object property</td></tr>
</table>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
short val;
V<M<name,short,&val>>().read(in);
struct Pdo { int prop; };
O<Pdo, P<Pdo, short, &Pdo::prop>>().write(out);
</pre>
<p>These shorn-name functions are just aliases for a wide set of long name functions. If you experience difficulties
supplying parameters to a short function, use appropriate long function. You may toggle <span class="term">Compact</span>
variant in <a href="https://hutorny.in.ua/codegen/cojson.html" target="_blank"><span class="term">codegen</span></a>'s
options to learn how.
</p>
<h4 id="section-2.1">2.1. Values</h4>
<p>A value is defined with template <span class="term">V</span>.
Please refer to <a href="#appendix-I">Appendix I</a> for a comprehensive description of all available variants</p>
<p><a href="#RFC7159">RFC7159</a> states that a <span class="term">JSON</span> text is a serialized value.
E.g. it is not necessarily object or array.
<span class="term">cojson</span> support this feature by enabling various possibilities for data bindings.</p>
<p style="margin-bottom:0">A <span class="term">JSON</span> value can be bound to: </p>
<ul style="margin-top:0;margin-bottom:0"><li>a property of C++ class (the preferable way),</li>
<li>a pair of getter/setter method, </li>
<li>to a static variable,</li>
<li>to a function, returning pointer to a variable,</li>
<li>a pair of getter/setter functions.</li>
</ul>
<p style="margin-top:0">Values, bound to static variables or functions can also be organized in a
<span class="term">JSON</span> array or object. Such objects will further be referred as
<em>statically-bound</em> to distinguish them from <em>class-bound</em> objects</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
short v1=1;
long v2=2;
double v3=3;
long& func() { return v2; }
double get() { return v3; }
void set(double v) { v3 = v; }
V<short, &v1>().write(out); // 1,
V<long, func>().write(out); // 2,
V<double, get, set>().write(out); // 3.0
</pre>
<h4 id="section-2.2">2.2. Objects</h4>
<p>Class-bound objects are defined with variadic template <span class="code">O</span> that accepts bounding
class as the first parameter followed by the list of members. This implies that the class is defined
upfront. Statically-bound objects are defined with variadic template <span class="code">V</span> with list
of members as its parameters.</p>
<p>Members of class-bound objects are defined with templates <span class="code">P</span>,
while members of statically-bound objects are defined with templates <span class="code">M</span>.
Both of them accept member name as a parameter.</p>
<h5 id="section-2.2.1">2.2.1. Object Names</h5>
<p>Direct use of string literals as templates parameters is not supported by C++11.
Therefore <span class="term">cojson</span> defines name as a function returning pointer
to string <span class="code">const char*</span>. This workaround does not allow inline
name definitions, e.g. a name should be declared before its use.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
short var = 1;
static constexpr const char* myname() noexcept { return "myname"; }
struct Pdo {
static short sprop;
long lprop;
static constexpr const char* propname() noexcept { return "prop"; }
} pdo;
short Pdo::sprop = 2;
V< // statically-bound object { "myname":1, "prop":2 }
M<myname,short,&var>,
M<Pdo::propname,short,&Pdo::sprop>
>().write(out);
O<Pdo, // class-bound object { "prop":2 }
P<Pdo,Pdo::propname,long,&Pdo::lprop>
>().read(pdo, in);
</pre>
<h5 id="section-2.2.2">2.2.2. Nested Objects</h5>
<p>Both class-bound and statically-bound classes allow nested objects.
Nesting in a class-bound object is achieved with a special version of template <span class="code">P</span> that
accepts additional parameter - model definition for the nested object.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
struct Config {
struct Wan {
long uptime;
} wan;
static constexpr const char* name_wan() noexcept { return "wan"; }
static constexpr const char* name_uptime() noexcept { return "uptime"; }
static const clas<Config>& json() noexcept {
return
O<Config, //{
P<Config, name_wan, Config::Wan, &Config::wan, // "wan":
O<Wan, // {
P<Wan, name_uptime, decltype(Wan::uptime), &Wan::uptime> // "uptime":1
> // }
>>(); //}
}
};
</pre>
<p>Nesting in a statically-bound objects is achieved with a is generic version of template
<span class="code">M<name,value></span> where in place of value
a nested definition is used.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
short v1=1;
static constexpr const char* p1() noexcept { return "p1"; }
static constexpr const char* p2() noexcept { return "p2"; }
const value& nested() {
return
V< // {
M<p1, // "p1" :
V< // {
M<p2,short,&v1> // "p2":1
>> // }
>(); // }
}
</pre>
<h5 id="section-2.2.3">2.2.3. Object Instances</h5>
<p>A class-bound object needs an instance of that class available for read/write operation.
There is no constraints on how that instance is allocated.
A statically bound object does not need any instance by itself, each of its members may access
different kinds of storage and some members may require data storage allocated at compile time.</p>
<h5 id="section-2.2.4">2.2.4. Extra or Missing Members</h5>
<p>If a <span class="term">JSON</span> text is missing some members defined in a
<span class="term">cojson</span> object, data fields bound to those members
will not be updated and no error condition will be set. An empty object (<span class="code">{}</span>)
is a valid input for any <span class="term">cojson</span> object.</p>
<p>Extra members, found in a <span class="term">JSON</span> text, are ignored by default.
However, this behavior may be altered with a library-wide configuration constant.</p>
<h5 id="section-2.2.5">2.2.5. Zero Objects</h5>
<p>As per <a href="#RFC7159">RFC7159</a>, a <span class="term">JSON</span> object consist
of zero or more name/value pairs (or members).
<span class="term">cojson</span> allow defining zero-member objects. However, due to ambiguity with empty array,
only long name template function allow this option (e.g. <span class="code">cojson::details::ValueObject<></span>)</p>
<h4 id="section-2.3">2.3. Arrays</h4>
<p><span class="term">cojson</span> is designed to work with a predefined structure and this design
imposes certain limitation on arrays - only homogeneous array (<em>vector</em>) may have unspecified length.
A heterogeneous array (<em>ordered list</em>) must have each its item defined.
</p>
<h5 id="section-2.3.1">2.3.1. Ordered Lists</h5>
<p>Ordered lists are defined with variadic template <span class="code">V</span> with list of items as its parameters.
Every item should also be an instantiation of template <span class="code">V</span>.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
short v1=1, v2=2, v3=3;
short& func() { return v2; }
short get() { return v3; }
void set(short v) { v3 = v; }
V< // [
V<short, &v1>, // 1,
V<short, func>, // 2,
V<short, get, set> // 3
>().write(out); // ]
</pre>
<h5 id="section-2.3.2">2.3.2. Vectors</h5>
<p>Vectors are defined with template <span class="code">V</span> and can be bound to a fixed-size C++ array
or to a <em>indexer</em> - a function returning pointer to the requested item. The first form defines a
fixed-length array while the second - a variable-length array.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
int data[4] = { 1,2,3,4 };
unsigned count = 2;
static int* arr(unsigned i) noexcept {
return i < count ? data + i : nullptr;
}
V<int,arr>().write(out); // [1,2]
V<int,4,data>().write(out); // [1,2,3,4]
</pre>
<h5 id="section-2.3.3">2.3.3. Arrays of Objects</h5>
<p>Vectors are defined with template <span class="code">V<X,S></span>,
where X is an accessor class and S is the object's model definition.
Two accessors - <span class="code">accessor::array</span> and <span class="code">accessor::vector</span>
implement two possible bindings to an indexer or to a static array.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
struct Item {
static constexpr const char* name_a() noexcept { return "a"; }
static constexpr const char* name_b() noexcept { return "b"; }
short a, b;
};
Item Items[4];
void tutorial_example4(lexer&, ostream& out) {
V<accessor::array<Item,4,Items>,
O<Item,
P<Item, Item::name_a, decltype(a), &Item::a>,
P<Item, Item::name_b, decltype(b), &Item::b>
>
>().write(out);
}
</pre>
<h5 id="section-2.3.4">2.3.4. Nested Arrays</h5>
<p>An ordered list may seamlessly include another list or vector.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
int data[4] = { 1,2,3,4 };
unsigned count = 2;
static int* arr(unsigned i) noexcept {
return i < count ? data + i : nullptr;
}
V< // [
V<int,arr>, // [1,2]
V<int,4,data> // [1,2,3,4]
>().write(out); // ]
</pre>
<p>Other variants require more complicated technique: defining a C++ type for the inner
array and implementing custom reader/writer for that type.</p>
<h5 id="section-2.3.1">2.3.5. Arrays in Classes</h5>
<p>An array field of an C++ class can be added to <span class="term">cojson</span> model
with special form of template <span class="code">P</span>.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
struct Pdo {
short data[4];
};
static constexpr const char* arr() noexcept { return "arr"; }
Pdo pdo;
O<Pdo,
P<Pdo, arr, short, countof(&Pdo::data), &Pdo::data>
>().read(pdo,in);
</pre>
<h5 id="section-2.3.4">2.3.6. Extra or Missing Items</h5>
<p>Array items from the <span class="term">JSON</span> text that do not fit
<span class="term">cojson</span> array definition are skipped and the
<span class="code">overrun</span> flag is set in the <span class="code">iostate::error</span>
If input array is shorter than defined in the model, remaining items are not updated.</p>
<h4 id="section-2.4">2.4. Numbers</h4>
<p>A number is defined with template <span class="code">V</span> that accepts the destination data
and binding argument.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
double ldv;
V<decltype(ldv),&ldv>().read(in);
</pre>
<p><span class="term">cojson</span> supports all fundamental numeric C++ types, except long double.
When a number from <span class="term">JSON</span> text does not fit the destination data type,
an overflow condition occurs. By default <span class="term">cojson</span> ignores overflow.
This can be altered with configuration constant.</p>
<h4 id="section-2.5">2.5. Strings</h4>
<p>A read/write string is defined with template <span class="code">V</span> that accepts string
length as the first parameter and data binding (directly array or a function returning pointer).
A string which is only needed for writing is defined with template <span class="code">V</span>
with a single parameter - function returning <span class="code">const char*</span> pointer.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
char str[20];
static char* data() noexcept { return str; }
static constexpr const char* info() noexcept { return "info"; }
V<20,str>().read(in);
V<10,data>().read(in);
V<info>().write(out);
</pre>
<h4 id="section-2.6">2.6. Reading/Writing</h4>
<h5 id="section-2.6.1">2.6.1. Via <span class="code">std::iostream</span> or similar</h4>
<p><span class="code">cojson::wrapper</span> namespace provides template wrappers for C++ streams:
<span class="code">istream</span> and <span class="code">ostream</span>, for reading and writing
respectively. They require the wrapped streams to provide <span class="code">get(char) good() eof() / put(char) good()</span>
and can wrap almost any of the <span class="term">stdlib</span> streams.
<pre class="brush: cpp; collapse: true; light: false; title: Example; toolbar: true; notranslate" title="Example">
#include <iostream>
#include <cojson_stdlib.hpp>
static constexpr const char* Int() noexcept { return "Int"; }
struct MyClass {
int Int;
} obj;
cojson::wrapper::istream<std::istream> in(cin);
cojson::wrapper::ostream<std::ostream> out(cout);
O<MyClass,P<MyClass,Int,decltype(MyClass::Int),&MyClass::Int>>().read(obj, in);
O<MyClass,P<MyClass,Int,decltype(MyClass::Int),&MyClass::Int>>().write(obj, out);
</pre>
</p>
<h5 id="section-2.6.2">2.6.2. Via a memory buffer</h5>
<p><span class="code">cojson::wrapper</span> namespace provides wrappers for memory buffers:
<span class="code">buffer</span> and <span class="code">memstream</span>.
Both read from and write to a single memory block. <span class="code">memstream</span> maintains
two separate position pointers while <span class="code">buffer</span> maintains only one.
When no writing is needed, <span class="code">buffer</span> may by supplied with a constant zero-delimited string.
<pre class="brush: cpp; collapse: true; light: false; title: Example; toolbar: true; notranslate" title="Example">
#include <cojson.hpp>
using namespace cojson;
struct MyClass {
int Int;
static constexpr const char* Int_() noexcept { return "Int"; }
static inline const auto& json() noexcept {
return O<MyClass,P<MyClass,&MyClass::Int_,decltype(MyClass::Int),&MyClass::Int>>();
}
inline int read(const char* data) noexcept {
wrapper::buffer input(data);
details::lexer in(input);
return json().read(*this, in) ? input.count() : -1;
}
inline int write(char* data, cojson::size_t size) noexcept {
wrapper::buffer output(data, size);
return json().write(*this, output) ? output.count() : -1;
}
};
</pre>
</p>
<h5 id="section-2.6.3">2.6.3 Via a user-defined reader/writer</h5>
<p>To read a <span class="term">JSON</span> text you need to pass it through
<span class="code">istream</span> interface to a <span class="code">lexer</span>
instance and then pass it to the model's read method.<br>
For writing you need an <span class="code">ostream</span> interface
Please refer to <a href="#section-3">Section-3</a> for more details.</p>
<p>When read/write operation is complete, application, may examine stream's
<span class="code">error()</span> flags to identify possible errors.</p>
<p>If your <span class="term">JSON</span> text may start with <span class="term">BOM</span>
sequence, call <span class="code">lexer.skip_bom()</span>.</p>
<p>Please also refer to
<a href="section-5.1">Section 5.1</a> and <a href="#section-5.2">Section 5.2</a> for details.
</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
#include <iostream>
#include "cojson.hpp"
using namespace cojson;
using namespace details;
class jsonw : public ostream {
private:
std::ostream & out;
public:
inline jsonw(std::ostream& o) noexcept : out(o) {}
bool put(char_t c) noexcept {
if( out.put(c).good() ) return true;
error(details::error_t::ioerror);
return false;
}
};
class jsonr : public istream {
std::istream& in;
private:
bool get(char_t& c) noexcept {
if( in.get(c).good() ) return true;
if( in.eof() ) {
error(details::error_t::eof);
c = iostate::eos_c;
} else {
error(details::error_t::ioerror);
c = iostate::err_c;
}
return false;
}
public:
inline jsonr(std::istream& i) noexcept
: in(i) {}
};
using namespace std;
const char * hello() { return "Hello World!"; }
char answer[10];
int main(int, char**) {
jsonr inp(cin);
lexer in(inp);
jsonw out(cout);
V<hello>().write(out);
in.skip_bom();
V<sizeof(answer),answer>().read(in);
return 0;
}
</pre>
<h3 id="section-3">3. Implementing Stream Interfaces</h3>
<p><span class="term">cojson</span> provides implementation of I/O stream interfaces for
character buffers and wrappers for <span class="code">std::istream</span> and
<span class="code">std::ostream</span> (defined in <span class="code">cojson_stdlib.hpp</span>).
<br/>Luckily, these interfaces need just one method each to implement.</p>
<h4 id="section-3.1">3.1. <span class="term">istream</span> Interface</h4>
<pre class="brush: cpp; title: ; notranslate" title="">
struct my_istream : istream {
bool get(char_t& dst) noexcept {
/* Read a single character from the stream, place it in the dst and advance current position.
* Return true on success or false on error.
* In latter case put error code (iostate::eos_c or iostate::err_c) in the dst
* and set error flag with istream::error (error_t::eof or error_t::ioerror) */
}
};
</pre>
<h4 id="section-3.2">3.2. <span class="term">ostream</span> Interface</h4>
<pre class="brush: cpp; title: ; notranslate" title="">
struct my_ostream : ostream {
bool put(char_t c) noexcept {
/* Write a single character to the output
* Returns true on success or false on error
* In latter case set error flag with istream::error (error_t::ioerror) */
}
};
</pre>
<a id="build"></a><h3 id="section-4">4. Building</h3>
<p>To build application with <span class="term">cojson</span>, add its source
directory <span class="code">cojson/src</span> to the include path, add the following source files in your project:</p>
<ul>
<li>cojson/src/cojson.cpp</li>
<li>cojson/src/cojson_libdep.cpp</li>
<li>cojson/src/platforms/shared/chartypetable.cpp</li>
</ul>
<p>With avr-g++ you should use all files from <span class="code">cojson/src/platforms/avr/</span>directory.</p>
<p>On some platform you may get error about missing <span class="code">type_traits</span> and
<span class="code">limits</span> files. These files are part of STD C++ library. If your
compiler does not find them, it means STD C++ lib is not available on your platform.
These files are needed for compilation only and do not introduce any run-time artifact.
You may use this file from the STD C++ lib on your build machine, provided both gcc versions matches in major and minor numbers</p>
<pre class="brush: plain; title: ; notranslate" title="">
$ cd cojson/include
$ ln -s /usr/include/c++/4.9/limits .
$ ln -s /usr/include/c++/4.9/type_traits .
</pre>
<p>and add cojson/include directory to the include path. Without STD C++ library
you may also get linker errors about missing symbols <span class="code">__cxa_*</span>
<span class="code">operator new, operator delete</span>.</p>
<p><span class="code">cojson</span> does not use <span class="code">new, delete</span>, if your application does the same,
you may safely stub those symbols with no implementation.</p>
<p><span class="code">__cxa_*</span> symbols are part of libc++ abi specification.
Most critical of possibly missing symbols are <span class="code">__cxa_guard_acquire</span>
and <span class="code">__cxa_guard_release</span>. You may find a simple implementation
for them in <span class="code">cojson/src/platforms/avr/avrcppfix.cpp</span> or use any other
suitable implementation.</p>
<p>On some platforms replacing <span class="code">__cxa_pure_virtual</span> with empty implementation saves sufficient
amount of program memory. Perhaps this fact is caused by presence of comprehensive diagnostic
messages in the built-in function.</p>
<h3 id="section-5">5. Advanced Topics</h3>
<p><span class="code">cojson</span> can be easily extended with new functionality that
your application may need. This is possible along two axes - (1) parsing/serializing
a value and (2) delivering the parsed value to the application.</p>
<p>Parsing and serializing a value is done via reader and writer templates.
Delivering the value - with accessor templates.</p>
<h4 id="section-5.1">5.1. User Defined <span class="term">reader</span></h4>
<p>To define a reader, provide an explicit specialization for template <span class="code">reader</span>
with the destination type and implement method <span class="code">read</span>.
This method should read input text char-by-char from the lexer, transform them into the value of
destination type and return true on success or false on error.</p>
<p>In case of an error it should not leave the lexer in the middle of a lexeme, e.g.
if error is detected on the first character it should send it back with
<span class="code">lexer.back()</span>. If a recoverable error occurs in the middle
of a lexeme, <span class="code">read</span> should consume remaining characters
of the lexeme and set error flag <span class="code">error_t::mismatch</span>.
On an irrecoverable error, such as syntax violation, reader should set
<span class="code">error_t::bad</span> flag and return <span class="code">false</span>.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
//cojson reader for std::string
#include <string>
#include "cojson.hpp"
namespace cojson {
namespace details {
template<>
bool reader<std::string>::read(std::string& dst, lexer& in) noexcept {
std::string tmp;
bool first = true;
ctype ct;
char chr;
while( (ct=in.string(chr, first)) == ctype::string ) {
tmp += chr;
first = false;
}
if( chr ) {
in.error(error_t::bad);
return false;
}
dst = tmp;
return true;
}</pre>
<h4 id="section-5.2">5.2. User Defined <span class="term">writer</span></h4>
<p>To define a writer, provide an explicit specialization for template <span class="code">writer</span>
with the destination type and implement method <span class="code">write</span>.
This method should convert input value to string and put it char-by-char to the
output stream and return true on success or false on error.</p>
<p>Once you have reader/writer, you may used variables of that type for data bindings.</p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
//cojson writer for std::string
template<>
bool writer<std::string>::write(const std::string& str, ostream& out) noexcept {
return writer<const char*>::write(str.c_str(), out);
}
//using std::string
std::string str;
V<std::string, &str>().write(out);
</pre>
<h4 id="section-5.3">5.3. User Defined <span class="term">accessor</span></h4>
<p>Accessor is a C++ template that wraps various ways of getting and setting variable
value into a uniform, compile-time interface. Namespace
<span class="term">cojson::accessor</span> contains several accessors. To create your own,
copy one most suitable from existing accessor templates, and adjust its parameters
method implementations and constant values as needed. </p>
<pre class="brush: cpp; collapse: true; light: false; title: Examples; toolbar: true; notranslate" title="Examples">
// Custom accessor via class methods.
// Differs from original by the signatures of setter/getter
template<class C, typename T, const T& (C::*G)() const,
C& (C::*S)(const T&)>
struct mymethods {
typedef C clas;
typedef T type;
static constexpr bool canget = true;
static constexpr bool canset = true;
static constexpr bool canlref= false;
static constexpr bool canrref= false;
static constexpr bool is_vector = false;
static inline constexpr bool has() noexcept { return true; }
static inline T get(const C& o) noexcept { return (o.*G)(); }
static T& lref(const C& o) noexcept; /* not possible */
static const T& rref(const C&) noexcept; /* not possible */
static inline void set(C& o, const T& v) noexcept { (o.*S)(v); }
static inline void init(T&) noexcept { }
static inline constexpr bool null(C&) noexcept {
return not config::null_is_error;
}
private:
mymethods ();
};
// Using custom accessor
struct Do {
const int& get() const;
Do& set(const int&);
static const char* name() { return "val"; }
bool read(lexer& in) {
return O<Do,P<Do,&Do::name,
mymethods<Do,int,&Do::get,&Do::set>>>().read(*this,in);
}
};</pre>
<h4 id="section-5.4">5.4. Configuring <span class="term">cojson</span></h4>
<p><span class="term">cojson</span> is configured with <a href="http://hutorny.in.ua/research/cascaded-configuration-sets-for-c1y">Cascaded Configuration Sets</a> technics.</p>
<p>For the simplest case, place an empty <span class="code">configuration.h</span> located on the include path
earlier than the original <span class="code">src/configuration.h</span>.
If necessary, make a copy of <span class="code">src/configuration.h</span>, uncomment definitions there and sjudt values as needed
</p>
<table class="table">
<tr><th>Symbol</th><th>Values</th><th>When specified...</th></tr>
<tr><td rowspan="3">overflow</td><td>saturate</td><td>numbers are saturated on overflow</td></tr>
<tr><td>error</td><td>overflow causes an error</td></tr>
<tr><td>ignore</td><td>overflow condition silently ignored</td></tr>
<tr><td rowspan="2">mismatch</td><td>skip</td><td>reader makes best efforts to skip such values</td></tr>
<tr><td>error</td><td>any mismatch in size or data type is treated as an irrecoverable error</td></tr>
<tr><td rowspan="2">null</td><td>skip</td><td>skip nulls by default</td></tr>
<tr><td>error</td><td>default handling for null is raising irrecoverable error</td></tr>
<tr><td rowspan="2">iostate</td><td>_notvirtual</td><td>stream's error method are not virtual</td></tr>
<tr><td>_virtual</td><td>stream's error method are virtual.
This allows to implement better error reporting by overriding iostate::error methods</td></tr>
<tr><td rowspan="2">temporary</td><td>static</td><td>temporary buffer is implemented static</td></tr>
<tr><td>_automatic</td><td>temporary buffer is implemented automatic (allocated on the stack)</td></tr>
<tr><td>temporary_size</td><td><number></td><td>overrides temporary buffer size</td></tr>
<tr><td rowspan="2">cstring</td><td>avr_progmem</td><td>use progmem for defining literals and member names (AVR only)</td></tr>
<tr><td>const_char</td><td>literals and member names are defined constant strings (const char*), default</td></tr>
</table>
static constexpr cstring_is cstring = cstring_is::avr_progmem;
<h3 id="section-R">Normative References</h3>
<ol>
<li><a href="https://tools.ietf.org/html/rfc7159" name="RFC7159" target="_blank">RFC7159</a></li>
</ol>
<h3 id="section-I">Informative References</h3>
<ol>
<li><a href="http://libcxxabi.llvm.org/spec.html" target="_blank">libc++abi Specification</a></li>
</ol>
<h3 id="appendix-I">Appendix I. Guide Map</h3>
<table class="table guide">
<tr><th><span class="term">JSON</span> text</th><th>C++</th><th><span class="term">cojson</span> definition</th><th>Comments</th></tr>
<tr><td colspan="4" style="text-align:center"><h5 style="margin:0">
Statically bound values
</h5></td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">123</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">long myvar;</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<long,&myvar></pre></td><td>Value bound to a variable. The simplest binding</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">345</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">short& myfunc() {
static short myvar;
return myvar;
}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<long,myfunc></pre></td><td>
Value bound to a function returning reference.
Bindings via functions allows application to detect presence
of the value in the stream and perform on-demand space allocation
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">678</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">int* myfunc() {
static int myvar;
return &myvar;
}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<int,myfunc></pre></td><td>
Value bound to a function returning pointer. In this binding
function may return <span class="code">nullptr</span> if value
is not available. Because of this <span class="code">cojson</span>
calls it twice per value.
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">true</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">static bool myval;
bool my_get() {
return myval; }
void my_set(bool val) {
myval = val; }
</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<bool,my_get,my_set></pre></td><td>
Value bound to a getter/setter pair. This binding allows handling values
with no storage behind and perform validation of the parsed values</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">"a string"</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">char mystring[24];</pre></td>
<td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<24,mystring></pre></td><td>
String bound to an array of char.
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">"output only"</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">const char* msg() {
return "output only";
}</pre></td>
<td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<msg></pre></td><td>
A string value available for writing only.
The content does not have to be constant.
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">"a string"</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">char* data = nullptr;
static char* mystr() {
if( data == nullptr )
data = (char*) malloc(64);
return data;}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<64,mystr></pre></td><td>
String binding via a function returning pointer
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">[1,2,3,4]</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">int data[4];</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<int,4,data></pre></td><td>
Array (vector) bound to a C++ array
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">[1,2,3]</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">int data[4];
size_t count = 3;
int* func(size_t i) {
return i<count
? data+i : nullptr;
}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V<int,func></pre></td><td>
Vector binding via a function. It allows controlling array length
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">[2.1, "kg"]</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">double val;
char unit[8];</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">V< V<double,&val>,
V<8,unit>></pre></td><td>
Heterogeneous array bound to static variables
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"v":20}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">int v1;</pre></td>
<td><sup style="float:left;font-size:60%"><a href="#fn1"
title="NAME here is a macro that defines a name">1</a></sup>
<pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(v)
V< M<v, int, &v1> >
</pre></td><td>
Object with a member bound to static variable.
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"u":"s"}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">char u1[8];</pre></td>
<td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(u)
V< M<u, V<8, u1>> >
</pre></td><td>
Object with a member bound to a <span class="term">cojson</span> value.</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"s":"x"}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">char* data;
static char* mystr() {
return data;
}
</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(s)
V<M<s,16,mystr>></pre></td><td>
Object with a string member bound to a function
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"v":4}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">char& myfunc() {
static char myvar;
return myvar;
}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(v)
V<M<v,char,myfunc>></pre></td><td>
Member bound to a function returning reference.</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"v":5}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">
static double myvar;
double* myfunc() {
return &myvar;
}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(v)
V<M<v,doublemyfunc>></pre></td><td>
Member bound to a function returning pointer.</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"led":0}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">int get() {
return PORTA&LED_BIT;}
void set(int v) {
if(v) PORTA|=LED_BIT;
else PORTA&=~LED_BIT;}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(led)
V<M<led,
functions<int,get,set>
>></pre></td><td>
Member bound to a pair of functions
</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"a":"info"}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">const char* info() {
return "info";
}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a)
V<M<a,info>></pre></td><td>
Member bound to an output only string </td></tr>
<tr><td colspan="4" style="text-align:center"><h5 style="margin:0">
Class bound objects and their members
</h5></td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{ ... }</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
//...
};</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">O<...></pre></td><td>
Class bound object</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"a":"15.10.20"}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
char a[16];
};</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a)
O<Pdo,
P<Pdo,16,&Pod::a>></pre></td><td>
Member bound to a class property</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"led":true}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
bool get() {
return PORTA&LED_BIT;}}
void set(bool v) {
if(v) PORTA|=LED_BIT;
else PORTA&=~LED_BIT;}
};</pre></td><td class="smaller"><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(led)
O<Pdo,
M<Pdo,led,methods<
bool,Pdo::get,Pdo::set>
>></pre></td><td>
Member bound via getter/setter methods</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"a":15}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
int a;
};</pre></td><td class="smaller"><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a)
O<Pdo,
P<Pdo,int,&Pod::a>></pre></td><td>
String member bound to a class property</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"a":[1,2]}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
short a[2];
};</pre></td><td class="smaller"><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a)
O<Pdo,
P<Pdo,a,short,
2,&Pdo::a>></pre></td><td>
Array-vector bound to an array property of class Pdo</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"a":{"b":10}}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
struct A {
int b;
} a;};</pre></td><td class="smaller"><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a) NAME(b)
O<Pdo, P<Pdo,a,Pdo::A,&Pdo::a,
O<Pdo::A,
P<Pdo::A,b,int,&Pdo::A::b>>>></pre></td><td>
Nested object</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">{"a":[{"b":1},
{"b":2}]}</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
struct A {
int b;
} a[2];
};</pre></td><td class="smaller"><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a) NAME(b)
O<Pdo, P<Pdo,a,Pdo::A,2,Pdo::a,
O<Pdo::A,
P<Pdo::A,b,int,&Pdo::A::b>>>></pre></td><td>
Nested array of objects</td></tr>
<tr><td><pre class="brush: jscript; title: ; notranslate" title="">[{"a":1},
{"a":2}]</pre></td><td><pre class="brush: cpp; light: true; title: ; notranslate" title="">struct Pdo {
int a;
} pdo[2];</pre></td><td class="smaller"><pre class="brush: cpp; light: true; title: ; notranslate" title="">NAME(a)
V<array<Pdo,2,pdo>,
O<Pdo,P<a,int,&Pdo::a>>></pre></td><td>
Array of objects</td></tr>
</table>
<p><sup id="fn1">1</sup>NAME here is a macro that defines a <span class="term">cojson</span> name</p>
<pre class="brush: cpp; title: ; notranslate" title="">#define NAME(s) static inline constexpr const char* s() noexcept { return #s; }</pre>
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