不同编译器中的std :: filesystem和std :: experimental :: filesystem问题 [英] std::filesystem and std::experimental::filesystem problem in different compilers

问题描述

我正在编写一个使用std :: filesystem的库(仅供学习).它可以在MSVC上正常运行，但是默认情况下，Linux的LTS版本(如Ubuntu附带GCC 6.x)和官方存储库中的clang是3.8，它没有std :: filesystem，而我必须使用std :: experimental :: filesystem.如何解决此问题，以便可以支持GCC 6，GCC 8+(其中std :: filesystem工作)，Clang 3.8，最新的Clang和MSVC?我正在使用CMAKE作为构建系统

I am writing a library (just for learning) which utilizes std::filesystem. It works fine on MSVC however by default LTS releases of Linux like Ubuntu ships with GCC 6.x and clang in the official repository is 3.8 which doesn't have std::filesystem instead I have to use std::experimental::filesystem. How may I workaround this problem so that I can support GCC 6, GCC 8+ (where std::filesystem works), Clang 3.8, latest Clang and MSVC? I am using CMAKE as my build system

推荐答案

有条件的编译可能会有所帮助:

Conditional compilation may help:

#if(defined(_MSC_VER) or (defined(__GNUC__) and (7 <= __GNUC_MAJOR__)))
using n_fs = ::std::filesystem;
#else
using n_fs = ::std::experimental::filesystem;    
#endif

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