wchar_t类型

    wchar_t是ISO C/ANSI C的标准中的类型，他并没有定义其宽度，而留给具体的实现。在

windows下，为16bit，在unix like下为32bits。因此他并不具有portable特性，在不同环境下不一样，因此如果你想让你的程序具有可移植性，建议不要用wchar_t来存储你要存储的数据。

    Wide character is a computer programming term. It is a vague term used to represent a that is richer than the traditional (8-bit) characters. It is not the same thing as .

wchar_t is a data type in ANSI/ISO and some other that is intended to represent wide characters.

The standard 4.0 says that

"ANSI/ISO C leaves the semantics of the wide character set to the specific implementation but requires that the characters from the portable C execution set correspond to their wide character equivalents by zero extension."

and that

"The width of wchar_t is compiler-specific and can be as small as 8 bits. Consequently, programs that need to be portable across any C or C++ compiler should not use wchar_t for storing Unicode text. The wchar_t type is intended for storing compiler-defined wide characters, which may be Unicode characters in some compilers."

Under , wchar_t is 16 bits wide and represents a code unit. On -like systems wchar_t is commonly 32 bits wide and represents a code unit.

In , and deal with the wide characters.