在 gcc 4.3 上编译 C++ 时收到此消息
I get this message when compiling C++ on gcc 4.3
error: ‘NULL’ was not declared in this scope
它出现又消失,我不知道为什么.为什么?
It appears and disappears and I don't know why. Why?
谢谢.
NULL
不是关键字.它是一些标准头文件中定义的标识符.你可以包括
NULL
is not a keyword. It's an identifier defined in some standard headers. You can include
#include <cstddef>
将其纳入范围,包括一些其他基础知识,例如 std::size_t
.
To have it in scope, including some other basics, like std::size_t
.
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