19 Diagnostics library [diagnostics]

19.3 Assertions [assertions]

The header <cassert> provides a macro for documenting C++ program assertions and a mechanism for disabling the assertion checks.

#define assert(E) see below

The contents are the same as the C standard library header <assert.h>, except that a macro named static_assert is not defined.

An expression assert(E) is a constant subexpression, if

(1.1)
NDEBUG is defined at the point where assert is last defined or redefined, or
(1.2)
E contextually converted to bool is a constant subexpression that evaluates to the value true.