Section 3: library functions
std::numpunct – std::numpunct Synopsis Defined in header <locale> template< class CharT > class numpunct; The facet std::numpunct encapsulates numeric punctuation preferences. Stream I/O operations use std::numpunct through std::num_get and std::num_put for parsing numeric input and formatting numeric output. The numbers that are supported by std::numpunct have the format described below. Here digit represents the radix…
std::numeric_limits<T>::traps – std::numeric_limits<T>::traps Synopsis static const bool traps; (until C++ 11) static constexpr bool traps; (since C++ 11) The value of std::numeric_limits<T>::traps is true for all arithmetic types T that have at least one value that, if used as an argument to an arithmetic operation, will generate a trap. Standard specializations T value of std::numeric_limits<T>::traps…
std::numeric_limits<T>::tinyness_before – std::numeric_limits<T>::tinyness_before Synopsis static const bool tinyness_before; (until C++ 11) static constexpr bool tinyness_before; (since C++ 11) The value of std::numeric_limits<T>::tinyness_before is true for all floating-point types T that test results of floating-point expressions for underflow before rounding. Standard specializations T value of std::numeric_limits<T>::tinyness_before /* non-specialized */ false bool false char false signed char…
std::numeric_limits<T>::signaling_NaN – std::numeric_limits<T>::signaling_NaN Synopsis static T signaling_NaN() throw(); (until C++11) static constexpr T signaling_NaN() noexcept; (since C++11) Returns the special value "signaling not-a-number", as represented by the floating-point type T. Only meaningful if std::numeric_limits<T>::has_signaling_NaN == true. In IEEE 754, the most common binary representation of floating-point numbers, any value with all bits of the exponent…
std::numeric_limits<T>::round_style – std::numeric_limits<T>::round_style Synopsis static const std::float_round_style round_style; (until C++ 11) static constexpr std::float_round_style round_style; (since C++ 11) The value of std::numeric_limits<T>::round_style identifies the rounding style used by the floating-point type T whenever a value that is not one of the exactly repesentable values of T is stored in an object of that type. Standard…
std::numeric_limits<T>::round_error – std::numeric_limits<T>::round_error Synopsis static T round_error() throw(); (until C++11) static constexpr T round_error() noexcept; (since C++11) Returns the largest possible rounding error in ULPs (units in the last place) as defined by ISO 10967, which can vary from 0.5 (rounding to the nearest digit) to 1.0 (rounding to zero or to infinity). It is…
std::numeric_limits<T>::radix – std::numeric_limits<T>::radix Synopsis static const int radix; (until C++ 11) static constexpr int radix; (since C++ 11) The value of std::numeric_limits<T>::radix is the base of the number system used in the representation of the type. It is 2 for all binary numeric types, but it may be, for example, 10 for IEEE 754 decimal_floating-point_types…
std::numeric_limits<T>::quiet_NaN – std::numeric_limits<T>::quiet_NaN Synopsis static T quiet_NaN() throw(); (until C++11) static constexpr T quiet_NaN() noexcept; (since C++11) Returns the special value "quiet not-a-number", as represented by the floating-point type T. Only meaningful if std::numeric_limits<T>::has_quiet_NaN == true. In IEEE 754, the most common binary representation of floating-point numbers, any value with all bits of the exponent…
std::numeric_limits<T>::min_exponent10 – std::numeric_limits<T>::min_exponent10 Synopsis static const int min_exponent10; (until C++ 11) static constexpr int min_exponent10; (since C++ 11) The value of std::numeric_limits<T>::min_exponent10 is the lowest negative number n such that 10n is a valid normalized value of the floating-point type T. Standard specializations T value of std::numeric_limits<T>::min_exponent10 /* non-specialized */ 0 bool 0 char 0…
std::numeric_limits<T>::min_exponent – std::numeric_limits<T>::min_exponent Synopsis static const int min_exponent; (until C++ 11) static constexpr int min_exponent; (since C++ 11) The value of std::numeric_limits<T>::min_exponent is the lowest negative number n such that rn-1 , where r is std::numeric_limits<T>::radix, is a valid normalized value of the floating-point type T. Standard specializations T value of std::numeric_limits<T>::min_exponent /* non-specialized */…
std::numeric_limits<T>::min – std::numeric_limits<T>::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, especially when compared to…
std::numeric_limits<T>::max_exponent10 – std::numeric_limits<T>::max_exponent10 Synopsis static const int max_exponent10; (until C++ 11) static constexpr int max_exponent10; (since C++ 11) The value of std::numeric_limits<T>::max_exponent10 is the largest positive number n such that 10n is a representable finite value of the floating-point type T. Standard specializations T value of std::numeric_limits<T>::max_exponent10 /* non-specialized */ 0 bool 0 char 0…
std::numeric_limits<T>::max_exponent – std::numeric_limits<T>::max_exponent Synopsis static const int max_exponent; (until C++ 11) static constexpr int max_exponent; (since C++ 11) The value of std::numeric_limits<T>::max_exponent is the largest positive number n such that rn-1 , where r is std::numeric_limits<T>::radix, is a representable finite value of the floating-point type T. Standard specializations T value of std::numeric_limits<T>::max_exponent /* non-specialized */…
std::numeric_limits<T>::max_digits10 – std::numeric_limits<T>::max_digits10 Synopsis static constexpr int max_digits10 (since C++11) The value of std::numeric_limits<T>::max_digits10 is the number of base-10 digits that are necessary to uniquely represent all distinct values of the type T, such as necessary for serialization/deserialization to text. This constant is meaningful for all floating-point types. Standard specializations T value of std::numeric_limits<T>::max_digits10 /*…
std::numeric_limits<T>::max – std::numeric_limits<T>::max Synopsis Defined in header <limits> static T max() throw(); (until C++11) static constexpr T max() noexcept; (since C++11) Returns the maximum finite value representable by the numeric type T. Meaningful for all bounded types. Return value T std::numeric_limits<T>::max() /* non-specialized */ T() bool true char CHAR_MAX signed char SCHAR_MAX unsigned char UCHAR_MAX…
std::numeric_limits<T>::lowest – std::numeric_limits<T>::lowest Synopsis static constexpr T lowest() noexcept; (since C++11) Returns the lowest finite value representable by the numeric type T, that is, a finite value x such that there is no other finite value y where y < x. This is different from std::numeric_limits<T>::min() for floating-point types. Only meaningful for bounded types. Return…
std::numeric_limits<T>::is_specialized – std::numeric_limits<T>::is_specialized Synopsis static const bool is_specialized; (until C++ 11) static constexpr bool is_specialized; (since C++ 11) The value of std::numeric_limits<T>::is_specialized is true for all T for which there exists a specialization of std::numeric_limits. Standard specializations T value of std::numeric_limits<T>::is_specialized /* non-specialized */ false bool true char true signed char true unsigned char true…
std::numeric_limits<T>::is_signed – std::numeric_limits<T>::is_signed Synopsis static const bool is_signed; (until C++ 11) static constexpr bool is_signed; (since C++ 11) The value of std::numeric_limits<T>::is_signed is true for all signed arithmetic types T and false for the unsigned types. This constant is meaningful for all specializations. Standard specializations T value of std::numeric_limits<T>::is_signed /* non-specialized */ false bool false…
std::numeric_limits<T>::is_modulo – std::numeric_limits<T>::is_modulo Synopsis static const bool is_modulo; (until C++ 11) static constexpr bool is_modulo; (since C++ 11) The value of std::numeric_limits<T>::is_modulo is true for all arithmetic types T that are possible to (until C++11)handle overflows with modulo arithmetic, that is, if the result of addition, subtraction, multiplication, or division of this type would fall…
std::numeric_limits<T>::is_integer – std::numeric_limits<T>::is_integer Synopsis static const bool is_integer; (until C++ 11) static constexpr bool is_integer; (since C++ 11) The value of std::numeric_limits<T>::is_integer is true for all integer arithmetic types T and false otherwise. This constant is meaningful for all specializations. Standard specializations T value of std::numeric_limits<T>::is_integer /* non-specialized */ false bool true char true signed…