Includes the C Standard library header <assert.h> and adds the associated names to the std namespace. Including this header ensures that the names declared using external linkage in the C Standard library header are declared in the std namespace.

#include <cassert>

#define assert(E)

assert(E) is only constant, if NDEBUG is defined where assert is last defined or redefined, or E converted to bool evaluates to true.

assert Macro, _assert, _wassert
Header Files Reference
C++ Standard Library Overview
Thread Safety in the C++ Standard Library