如何在 g++ 6.2.0 和 -std=c++17 中包含 C++ 17 标头(可选、任意、string_view、变体)
std::optional 在 C++ 17 中，之前是 std::experimental::optional.
std::optional is in C++ 17, where it was std::experimental::optional before.
我尝试使用以下命令编译包含 <optional> 的文件:
I tried compiling a file which included <optional>, with the command:
g++ -std=c++17 <filename>.cpp
(在 Bash 终端中).我收到以下错误:
(in the Bash terminal). I get the following error:
<filename>.cpp:5:20 fatal error: optional: No such file or directory
#include <optional>
^
compilation terminated
但我可以 #include <experimental/optional> 就好了.
我是否缺少一些头文件?如何包含 optional 标头?
Am I missing some header files? How can I include the optional header?
我也不能包含 <any>、<string_view> 或 <variant>，得到同样的错误.
I also can't include <any>, <string_view> or <variant>, getting the same error.
推荐答案
你不能.
GCC 6.2 对 C++17 的支持是实验性的，它从字面上看，为什么标题是这样排列的.
GCC 6.2's support for C++17 is experimental, which is literally why the headers are arranged like this.
要是他们当初为 std::regex 这样做就好了！这是一份礼物.
If only they'd done this for std::regex back in the day! It's a gift.
https://gcc.gnu.org/projects/cxx-status.html#cxx1z
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