std::numeric_limits 在C/C++11中,std::numeric_limits为模板类,在库编译平台提供基础算术类型的极值等属性信息。 用于取代<climits>和<limits.h>,浮点常数定义于<cfloat>和<float.h>。 新的极值概念有两个优点, 一是提供了更好的类型安全性, 二是程序员可借此写出一些template以核定这些极值。 member member...
程序: // C++ program to illustrate// std::numeric_limits<T>::digits#include<bits/stdc++.h>#include<limits>usingnamespacestd;// Driver Codeintmain(){// Print the numeric digit for// the various data typecout<<"For int:"<< numeric_limits<int>::digits<<endl;cout<<"For float:"<< n...
std::numeric_limits<T>::has_denorm_loss std::numeric_limits<T>::round_style std::numeric_limits<T>::is_iec559 std::numeric_limits<T>::is_bounded std::numeric_limits<T>::is_modulo std::numeric_limits<T>::digits std::numeric_limits<T>::digits10 std::numeric_limits<T>::max_digits...
std::numeric_limits<T>::digits 的值是能无更改地表示类型 T 的radix 底位数。对于整数类型,这是不含符号位和填充位(若存在)的位数。对于浮点类型,这是尾数的位数(对于 IEC 559/IEEE 754 实现,这是存储尾数的位数加一,因为尾数有隐藏的前导 1 和二进制小数点)。
这个标准定义了表示浮点数的格式（包括负零-0）与反常值（denormal number），一些特殊数值（（无穷（...
std::numeric_limits<T>::digits staticconstintdigits; (until C++11) staticconstexprintdigits; (since C++11) The value ofstd::numeric_limits<T>::digitsis the number of digits in base-radixthat can be represented by the typeTwithout change. For integer types, this is the number of bits ...
numeric_limits::denorm_min Helper types float_round_style float_denorm_style staticT signaling_NaN()throw(); (until C++11) staticconstexprT signaling_NaN()noexcept; (since C++11) Returns the special value "signalingnot-a-number", as represented by the floating-point typeT. Only meaningful if...
class __numeric_limits_impl<__nv_bfloat16, __numeric_limits_type::__floating_point> { public: using type = __nv_bfloat16; static constexpr bool is_specialized = true; static constexpr bool is_signed = true; static constexpr int digits = 8; static constexpr int digits10 = 2; stat...
evaluates to a quiet NaN of typefloat (macro constant) has_quiet_NaN [static] identifies floating-point types that can represent the special value "quiet not-a-number" (NaN) (public static member constant ofstd::numeric_limits<T>)
In general, 'width' describes the minimum length of the output, while 'precision' limits the output. verbprecision t n/a b c o n/a x X n/a for number, strings are truncated to p bytes(!) e E f F number of places after decimal, default 6 g G set maximum number of digits s ...