Standard C++ Library Reference
<limits>
Defines the template class numeric_limits and two enumerations concerning floating-point representations and rounding.
For a list of all members of this header, see <limits> Members.
#include <limits>
Remarks
Explicit specializations of the numeric_limits class describe many properties of the fundamental types, including the character, integer, and floating-point types and bool that are implementation defined rather than fixed by the rules of the C++ language. Properties described in <limits> include accuracy, minimum and maximum sized representations, rounding, and signaling type errors.
See Also
Reference
Thread Safety in the Standard C++ LibraryOther Resources
<limits> MembersStandard C++ Library Header Files