编译时间运算符 [英] Compile time operators

问题描述

有人可以列出C ++中所有可用的编译时运算符吗?

Could someone please list a all compile time operators in available in C++?

推荐答案

C ++中有两个运算符，它们的结果始终可以在编译时确定，而与操作数无关，它们是sizeof [1 ]和:: [2].

There are two operators in C++ whose result can always be determined at compile-time, regardless of the operand(s), and those are sizeof[1] and ::[2].

当然，在编译时可以解析其他运算符的许多特殊用途，例如，整数常量表达式的标准中列出的那些运算符.

Of course there are plenty of particular uses of other operators that can be resolved at compile-time, for example those listed in the standard for integer constant expressions.

[1]与C ++不同，C99具有可变长度的数组类型.在编译时无法确定应用于VLA的sizeof.一些C ++编译器提供VLA作为扩展.

[1] C99, unlike C++, has variable length array types. sizeof applied to a VLA can't be determined at compile-time. Some C++ compilers provide VLAs as an extension.

[2]，即可以在编译时确定表达式的结果是什么实体.如果实体是对象，则对象的值是另一回事.

[2] that is, it can be determined at compile time what entity is the result of the expression. If the entity is an object, then the object's value is another matter.

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