update c++ standard to c++17

[cleoold]

the original compiler option version is too old

[sagar-barapatre]

This one's particularly for VSCode :
There's now a drop down (at least since VS 2017.3.5) where you can specifically select C++17. The available options are (under project > Properties > C/C++ > Language > C++ Language Standard)

1) ISO C++14 Standard. msvc command line option: /std:c++14
2) ISO C++17 Standard. msvc command line option: /std:c++17
3) The latest draft standard. msvc command line option: /std:c++latest

(I bet, once C++20 is out and more fully supported by Visual Studio it will be /std:c++20)

[cleoold]

Sorry, I don't get it.

[sagar-barapatre]

I mean download VS Code for better syncing.