C++ wstring转string 和 string转wstring 的一种方法

(认知有限，如有不妥，还请告知，欢迎讨论)

输出结果：

The type of "Hello World" is NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

The type of "Hello World" now is NSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEEE

The type of "Hello World" now is NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

=END=

=reference=

[1]www.cplusplus.com/reference/locale/wstring_convert/from_bytes/

[2]www.cplusplus.com/reference/locale/wstring_convert/to_bytes/