This page will attempt to describe features of modern C++ standards (C++17, etc.) supported by the game. For information on building the game, see BuildInstructions.

= Supported Compilers =
0 A.D. is a cross platform game written primarily in C++ and JavaScript, and as such it has to support multiple compilers with different implemented features. Here are the currently supported compilers for the game:

 * GCC 7 or newer
 * Clang 6 or newer
   * Shipped with Xcode 9.3 on OS X, which is 10.13+ (which also has 10.1)
 * Visual Studio 2017

In general, all features up to and including C++17 are usable, except for:
- C++17 std::filesystem is not supported on Apple Clang before the `10.15` SDK.
- C++17 std::variant is not supported on Apple Clang before the `10.13` SDK.
- C++17 std::any is not supported on Apple Clang before the `10.13` SDK.
- C++17 std::shared_mutex is not supported on MSVC when built with the `v141_xp` toolset.

See the following links for details: [https://docs.microsoft.com/fr-fr/cpp/overview/visual-cpp-language-conformance?view=msvc-160 MSVC] / [https://www.google.com/search?client=safari&rls=en&q=clang+c%2B%2B+support&ie=UTF-8&oe=UTF-8 Clang] / [https://gcc.gnu.org/projects/cxx-status.html GCC]

Known exceptions are the above features reported by Microsoft:

||= '''#''' =||= '''Name''' =||= '''Example''' =||
|| P1771R1 || `[[nodiscard]]` for constructors || ||
|| P0961R1 || Relaxing the structured bindings customization point finding rules || ||
|| P0969R0 || Allowing structured bindings to accessible members	|| ||
|| P0588R1 || Simplifying implicit lambda capture || ||
|| P1825R0 || Merged wording for P0527R1 and P1155R3, more implicit moves || ||
|| P0929R2 || Checking for abstract class types || || 
|| P0962R2 || Relaxing the range-for loop customization point finding rules || ||
|| P0859R0 || CWG 1581: When are constexpr member functions defined || ||
|| P1009R2 || Array size deduction in new-expressions || || 
|| P1286R2 || Contra CWG DR1778 || ||

There are nice features and should not be a concern in general. Note though that `[[nodiscard]]` cannot be used on constructors.