Difference between revisions of "C++20"

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| <code>[https://stackoverflow.com/a/60244416/5075760 Structural templates]</code> || C++20 || from 1.4? ||  || Partial      || Allow instances of arbitrary literal classes as template parameters. (display/drawing.cpp)
| <code>[https://stackoverflow.com/a/60244416/5075760 Structural templates]</code> || C++20 || from 1.4? ||  || Partial      || Allow instances of arbitrary literal classes as template parameters. (display/drawing.cpp)
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| <code>Mathematical Constants</code>|| C++20 ||                                            || 10      || 12.0.5 || Constants like std::numbers::pi.   
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Revision as of 09:19, 6 September 2023

See also C++11, C++17.

Some things that will be interesting to use once C++20 is common:

Feature Since Can use? GCC Apple Clang Comment
std::span C++20 from 1.3? 10 11.0.3 Handle buffers like standard library containers without risk of overflow.
std::format C++20 13 N/A Better and more efficient formatting of strings. Text Formatting
std::lerp C++20 from 1.4? 9 11.0.3 Linear interpolation. (ui/tools/pencil-tool.cpp)
std::bit_floor C++20 from 1.4? 9/10 11.0.3/13.0.0 Compute floor(log2(x)). (helper/mathfns.h)
Concepts C++20 from 1.4? 6/10 12.0.0 Partial Safer templating. (ui/controller.h)
Coroutines C++20 10 10.0.1 Partial Simpler asynchronous code. (trace/trace.cpp)
std::make_unique_for_overwrite C++20 11 N/A Don't zero arrays allocated using std::make_unique. (util/pool.cpp)
Ranges C++20 from 1.4? ? for (init; decl : expr). (ui/dialog/swatches.cpp)
Structural templates C++20 from 1.4? Partial Allow instances of arbitrary literal classes as template parameters. (display/drawing.cpp)
Mathematical Constants C++20 10 12.0.5 Constants like std::numbers::pi.

As of 1 September 2023, the CI runners for:

  • Linux:
    • appimage:linux GNU 9.4.0 (Using Ubuntu 20.04)
    • inkscape:linux GNU 11.4.0
  • Windows
    • inkscape:windows:build Gnu 13.1.0
    • inkscape:windows:dist Same as above.
  • macOS:
    • inkscape::macos:arm Apple Clang 13.1.6
    • inkscape:macos:x64: Apple Clang 14.0.0.

Errors and Deprecated items that we use:

  • error: call of overloaded ‘lerp(double, double&, double&)’ is ambiguous (ui/knot/knot-holder-entity.cpp)
  • warning: implicit capture of ‘this’ via ‘[=]’ is deprecated in C++20 [-Wdeprecated] https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0806r2.html
  • warning: bitwise operation between different enumeration types ‘Box3D::Axis’ and ‘Box3D::FrontOrRear’ is deprecated [-Wdeprecated-enum-enum-conversion]