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std::numeric_limits::min(3) C++ Standard Libary std::numeric_limits::min(3) NAME std::numeric_limits::min - std::numeric_limits::min Synopsis Defined in header <limits> static T min() throw(); (until C++11) static constexpr T min() noexcept; (since C++11) Returns the minimum finite value representable by the numeric type T. For floating-point types with denormalization, min() returns the minimum positive normalized value. Note that this behavior may be unexpected, espe- cially when compared to the behavior of min() for integral types. To find the value that has no values less than it, use lowest(). (since C++11) min() is only meaningful for bounded types and for unbounded un- signed types, that is, types that represent an infinite set of negative values have no meaningful minimum. Return value T std::numeric_limits<T>::min() /* non-specialized */ T() bool false char CHAR_MIN signed char SCHAR_MIN unsigned char 0 wchar_t WCHAR_MIN char8_t (since C++20) 0 char16_t (since C++11) 0 char32_t (since C++11) 0 short SHRT_MIN unsigned short 0 int INT_MIN unsigned int 0 long LONG_MIN unsigned long 0 long long (since C++11) LLONG_MIN unsigned long long (since C++11) 0 float FLT_MIN double DBL_MIN long double LDBL_MIN Example Demonstrates the use with typedef types, and the difference in the sign of the result between integer and floating-point types: // Run this code #include <cstddef> #include <iomanip> #include <iostream> #include <limits> template <typename T> void print_one(std::string_view type_name) { constexpr T min = std::numeric_limits<T>::min(); std::cout << std::dec << std::defaultfloat << std::setw(14) << type_name << " (" << std::setw(2) << sizeof(T) << " bytes): " << min; if constexpr (min != 0) std::cout << " or " << std::showbase << std::hex << std::hexfloat << min; std::cout << '\n'; } #define SHOW(T) print_one<T>(#T) int main() { SHOW(bool); SHOW(short); SHOW(unsigned short); SHOW(signed); SHOW(unsigned); SHOW(std::ptrdiff_t); SHOW(std::size_t); SHOW(float); SHOW(double); SHOW(long double); } Possible output: bool ( 1 bytes): 0 short ( 2 bytes): -32768 or 0x8000 unsigned short ( 2 bytes): 0 signed ( 4 bytes): -2147483648 or 0x80000000 unsigned ( 4 bytes): 0 std::ptrdiff_t ( 8 bytes): -9223372036854775808 or 0x8000000000000000 std::size_t ( 8 bytes): 0 float ( 4 bytes): 1.17549e-38 or 0x1p-126 double ( 8 bytes): 2.22507e-308 or 0x1p-1022 long double (16 bytes): 3.3621e-4932 or 0x8p-16385 See also lowest returns the lowest finite value of the given type [static] (C++11) (public static member function) denorm_min returns the smallest positive subnormal value of the given [static] floating-point type (public static member function) max returns the largest finite value of the given type [static] (public static member function) http://cppreference.com 2024.06.10 std::numeric_limits::min(3)
NAME | Synopsis | Return value | Example | Possible output: | See also
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