如何在 Visual Studio Code 中使用“hash_map”？

Question

I'm studying STL in Visual Studio Code.

I can't include 'hash_map'

#include <hash_map>

So I'm using 'unordered_map' temporarily

I wanna use 'hash_map'

Answer 1

There is no such header in the standard and the MSDN Documentation about <hash_map> [ 2 ] says:

This header is obsolete. The alternative is <unordered_map> .

Answer 2

You better have a good reason but the error message is very clear

c:\\program files (x86)\\microsoft visual studio\\2017\\community\\vc\\tools\\msvc\\14.12.25827\\include\\hash_map(16): fatal error C1189: #error: is deprecated and will be REMOVED. Please use <unordered_map>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning.

So just do this

#define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS
#include <hash_map>

You could also add _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to your project properties.

Answer 3

头文件在 c++11 中已过时，重命名为 unordered_map，参考： http : //en.cppreference.com/w/cpp/container/unordered_map