C++20
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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 1.4 | 10 | 11.0.3 | Handle buffers like standard library containers without risk of overflow. |
std::format |
C++20 | not yet | 13 | 15.3 | 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 | not yet | 10 | 10.0.1 Partial, 15.3 Full |
Simpler asynchronous code. (trace/trace.cpp) |
std::make_unique_for_overwrite
|
C++20 | not yet | 11 | 15.0.0 | Don't zero arrays allocated using std::make_unique. (util/pool.cpp) |
| Ranges | C++20 | not yet | ? | (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.
| |
Heterogenous lookup in std::unordered_map
|
C++20 | not yet | Faster lookup, use of smart pointers as keys. | ||
consteval static member functions
|
C++20 | not yet | Guaranteed compile time evaluation of member functions (stronger than constexpr)
|
References:
- General: https://en.cppreference.com/w/Template:cpp/compiler_support/20
- Apple Clang: https://developer.apple.com/documentation/xcode-release-notes
As of 10 July 2024, the CI runners for the various supported platforms are
- Linux:
- appimage:linux: GNU 13.2.0 (building on Ubuntu 24.04)
- inkscape:linux: Same as above
- Windows
- inkscape:windows:build: GNU 13.2.0
- inkscape:windows:dist: Same as above
- macOS:
- inkscape::macos:arm: Apple Clang 15.0.0
- inkscape:macos:x64: Apple Clang 13.0.0 (temporarily disabled since GTK4 port)
We strive to support latest Debian stable and latest Ubuntu LTS.
| Distro | gcc | clang | glib | glibmm | gtk4 | gtkmm4 | Can build? |
|---|---|---|---|---|---|---|---|
| Debian 12 (Bookworm, stable) | 12.2.0 | 15.0.6 | 2.74.6 | 2.74.0 | 4.8.3 | 4.8.3 | ❌ |
| Ubuntu 24.04 (Noble) | 13.2.0 | 18.1.3 | 2.80.0 | 2.78.1 | 4.14.2 | 4.10.1 | ✅ |
The build requires glibmm >= 2.78.1 and gtkmm4 >= 4.14. The build system will supply its own gtkmm4 if out-of-date. Therefore the build only currently works out of the box on Ubuntu 24.04.
Deprecated items that we still use:
- 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]