Standard library header <climits>

 

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Standard library headers

Language support <cfloat> <climits> <compare> (C++20) <contracts> (C++26) <coroutine> (C++20) <csetjmp> <csignal> <cstdarg> <cstddef> <cstdint> (C++11) <cstdlib> <exception> <initializer_list> (C++11)   <limits> <new> <source_location> (C++20) <stdfloat> (C++23) <typeinfo> <version> (C++20) Concepts <concepts> (C++20) Diagnostics <cassert> <cerrno> <debugging> (C++26) <stacktrace> (C++23) <stdexcept> <system_error> (C++11) Memory management <memory> <memory_resource> (C++17) <scoped_allocator> (C++11) Metaprogramming <meta> (C++26) <ratio> (C++11) <type_traits> (C++11)

General utilities <any> (C++17) <bitset> <bit> (C++20) <charconv> (C++17) <expected> (C++23) <format> (C++20) <functional> <optional> (C++17) <stdbit.h> (C++26) <tuple> (C++11) <typeindex> (C++11) <utility> <variant> (C++17) Containers <array> (C++11) <deque> <flat_map> (C++23) <flat_set> (C++23) <forward_list> (C++11) <hive> (C++26) <inplace_vector> (C++26)   <list> <map> <mdspan> (C++23) <queue> <set> <span> (C++20) <stack> <unordered_map> (C++11) <unordered_set> (C++11) <vector> Iterators <iterator> Ranges <generator> (C++23) <ranges> (C++20)

Algorithms <algorithm> <numeric> Strings <cctype> <cstring> <cuchar> (C++11) <cwchar> <cwctype> <string_view> (C++17) <string> Text processing <clocale> <codecvt> (C++11/17/26*) <locale> <regex> (C++11) <text_encoding> (C++26)   Numerics <cfenv> (C++11) <cmath> <complex> <linalg> (C++26) <numbers> (C++20) <random> (C++11) <simd> (C++26) <stdckdint.h> (C++26) <valarray> Time <chrono> (C++11) <ctime> C compatibility <ccomplex> (C++11/17/20*) <ciso646> (until C++20) <cstdalign> (C++11/17/20*) <cstdbool> (C++11/17/20*) <ctgmath> (C++11/17/20*)

Input/output <cinttypes> (C++11) <cstdio> <filesystem> (C++17) <fstream> <iomanip> <iosfwd> <iostream> <ios> <istream> <ostream> <print> (C++23) <spanstream> (C++23) <sstream> <streambuf> <strstream> (C++98/26*) <syncstream> (C++20) Concurrency support <atomic> (C++11) <barrier> (C++20) <condition_variable> (C++11) <future> (C++11) <hazard_pointer> (C++26) <latch> (C++20) <mutex> (C++11) <rcu> (C++26) <semaphore> (C++20) <shared_mutex> (C++14) <stdatomic.h> (C++23) <stop_token> (C++20) <thread> (C++11) Execution support <execution> (C++17)

 

This header was originally in the C standard library as <limits.h>.

This header is part of the type support library, in particular it's part of the C numeric limits interface.

Macros

BOOL_WIDTH (C++26)	bit width of bool (macro constant)
CHAR_BIT	bit width of byte (macro constant)
MB_LEN_MAX	maximum number of bytes in a multibyte character (macro constant)
CHAR_WIDTH (C++26)	bit width of char (macro constant)
CHAR_MIN	minimum value of char (macro constant)
CHAR_MAX	maximum value of char (macro constant)
SCHAR_WIDTHSHRT_WIDTHINT_WIDTHLONG_WIDTHLLONG_WIDTH (C++26)(C++26)(C++26)(C++26)(C++26)	bit width of signed char, short, int, long, and long long respectively (macro constant)
SCHAR_MINSHRT_MININT_MINLONG_MINLLONG_MIN (C++11)	minimum value of signed char, short, int, long and long long respectively (macro constant)
SCHAR_MAXSHRT_MAXINT_MAXLONG_MAXLLONG_MAX (C++11)	maximum value of signed char, short, int, long and long long respectively (macro constant)
UCHAR_WIDTHUSHRT_WIDTHUINT_WIDTHULONG_WIDTHULLONG_WIDTH (C++26)(C++26)(C++26)(C++26)(C++26)	bit width of unsigned char, unsigned short, unsigned int, unsigned long, and unsigned long long respectively (macro constant)
UCHAR_MAXUSHRT_MAXUINT_MAXULONG_MAXULLONG_MAX (C++11)	maximum value of unsigned char, unsigned short, unsigned int, unsigned long and unsigned long long respectively (macro constant)

Synopsis

// all freestanding
#define BOOL_WIDTH   /* see description */
#define CHAR_BIT     /* see description */
#define CHAR_WIDTH   /* see description */
#define SCHAR_WIDTH  /* see description */
#define UCHAR_WIDTH  /* see description */
#define USHRT_WIDTH  /* see description */
#define SHRT_WIDTH   /* see description */
#define UINT_WIDTH   /* see description */
#define INT_WIDTH    /* see description */
#define ULONG_WIDTH  /* see description */
#define LONG_WIDTH   /* see description */
#define ULLONG_WIDTH /* see description */
#define LLONG_WIDTH  /* see description */
#define SCHAR_MIN    /* see description */
#define SCHAR_MAX    /* see description */
#define UCHAR_MAX    /* see description */
#define CHAR_MIN     /* see description */
#define CHAR_MAX     /* see description */
#define MB_LEN_MAX   /* see description */
#define SHRT_MIN     /* see description */
#define SHRT_MAX     /* see description */
#define USHRT_MAX    /* see description */
#define INT_MIN      /* see description */
#define INT_MAX      /* see description */
#define UINT_MAX     /* see description */
#define LONG_MIN     /* see description */
#define LONG_MAX     /* see description */
#define ULONG_MAX    /* see description */
#define LLONG_MIN    /* see description */
#define LLONG_MAX    /* see description */
#define ULLONG_MAX   /* see description */