<cassert>
The <cassert> header (from the C standard <assert.h> header) declares the assert macro. The <cassert> header is unique in that you
can #include it multiple times to
obtain different effects (depending on whether the NDEBUG macro is defined at the time of
#include <cassert>).
Assertions are checked at runtime. You can use templates to craft compile-time assertions. See Appendix B for information about the Boost project, which supports compile-time assertions.
Instead of assertions, consider using exceptions, which offer more flexibility and control.
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