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fix: fix building on C++20 - fix removal of shared_ptr.unique #33

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Dec 30, 2021
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fix: fix building on C++20 - fix removal of shared_ptr.unique #33

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d9f3808
fix: fix building on C++20 - fix removal of shared_ptr.unique
aminya Nov 19, 2021
71e81b4
fix: simplify use_count comparison
aminya Dec 29, 2021
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4 changes: 3 additions & 1 deletion opennurbs_mesh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14831,7 +14831,9 @@ bool ON_MeshCache::Transform(
ON_Mesh* mesh = item->m_mesh_sp.get();
if (nullptr == mesh || mesh->IsEmpty())
continue;
if (false == item->m_mesh_sp.unique())
// NOTE: use_count() == 1 is an approximation in multi-threaded environments
// https:// en.cppreference.com/w/cpp/memory/shared_ptr/unique
if (false == item->m_mesh_sp.use_count() == 1)
{
// make a copy and transform the copy
std::shared_ptr<ON_Mesh>(new ON_Mesh(*mesh)).swap(item->m_mesh_sp);
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