问题描述
我已经看过并使用了如下的C ++代码：
I have seen and used C++ code like the following:
int myFourcc = 'ABCD';
它适用于最近的GCC版本，不知道最新版本。
标准中的这个功能吗？
它叫什么？
It works in recent versions of GCC, not sure how recent.Is this feature in the standard?What is it called?
我在搜索网络时遇到了麻烦...
I have had trouble searching the web for it...
EDIT：
我还为以后的观察者找到了此信息：
I found this info as well, for future observers:
从
例如，'ab'对于具有8位字符的目标，将被解释为（int）（（unsigned char）'a'* 256 +（unsigned char）'b'）'和'\234a' （int）（（unsigned char）'\234'* 256 +（unsigned char）'a'）'。
For example, 'ab' for a target with an 8-bit char would be interpreted as (int) ((unsigned char) 'a' * 256 + (unsigned char) 'b')', and '\234a' as (int) ((unsigned char) '\234' * 256 + (unsigned char) 'a')'.
推荐答案
请注意，根据C标准，字符常量，但是包含多个字符的字符常量的值是实现定义的。最新版本的GCC提供支持多字节字符常量，而不是错误警告多字符字符常量或警告：字符常数太长的类型。
"Note that according to the C standard there is no limit on the length of a character constant, but the value of a character constant that contains more than one character is implementation-defined. Recent versions of GCC provide support multi-byte character constants, and instead of an error the warnings multiple-character character constant or warning: character constant too long for its type are generated in this case."
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