c++ 断言

最新推荐文章于 2023-01-29 16:26:10 发布

原创最新推荐文章于 2023-01-29 16:26:10 发布 · 501 阅读

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#断言 #assert #static_assert

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1. assert

运行期断言，受NDEBUG控制

#ifdef NDEBUG #define assert(condition) ((void)0) #else #define assert(condition) /implementation defined/ #endif

The definition of the macro assert depends on another macro, NDEBUG, which is not defined by the standard library.

If NDEBUG is defined as a macro name at the point in the source code where <cassert> is included, then assert does nothing.

If NDEBUG is not defined, then assert checks if its argument (which must have scalar type) compares equal to zero. If it does, assert outputs implementation-specific diagnostic information on the standard error output and calls std::abort. The diagnostic information is required to include the text of expression, as well as the values of the standard macros __FILE__, __LINE__, and the standard variable __func__.

2. static_assert

编译期断言