Visual Studio 2017 can't find std::variant

问题

I am using Visual Studio 2017 - 15.9.7 for C++ development, and it looks like I have the necessary modules installed.

But the code below gives the error - "namespace "std" has no member "variant""

std::variant is supported in C++17 and looks like it was introduced to Visual Studio in 15.0

#include <iostream>
#include <variant>
int main()
{
    std::variant<int, double, std::string> value;
}

It looks like someone asked the same thing before, but the question appears to have been deleted.

回答1:

Project → Properties → C/C++ → Command Line /std:c++latest

Then click Apply and OK.

回答2:

You can also go Project > Properties > C/C++ > Language

and set C++ Language Standard to ISO C++17 Standard (/std:c++17)

make sure to be on All Configurations and All Platforms

来源：https://stackoverflow.com/questions/54668866/visual-studio-2017-cant-find-stdvariant