标准库提供所有以无 cv 限定的浮点类型作为形参from的类型的std::nexttoward重载。然而如果from对应的实参具有扩展浮点类型,那么对std::nexttoward的调用非良构,因为下个可表示值(或to)不保证能以longdouble表示。 (C++23 起) A)为算术类型的所有其他组合提供额外的std::nextafter重载。
Ifnum1ornum2has typelongdouble, thenstd::nextafter(num1, num2)has the same effect asstd::nextafter(static_cast<longdouble>(num1), static_cast<longdouble>(num2)). Otherwise, ifnum1and/ornum2has typedoubleor an integer type, thenstd::nextafter(num1, num2)has the same effect asstd:...
(const char* tagp); constexpr /* 浮点类型 */ nextafter(/* 浮点类型 */ x, /* 浮点类型 */ y); constexpr float nextafterf(float x, float y); constexpr long double nextafterl(long double x, long double y); constexpr /* 浮点类型 */ nexttoward(/* 浮点类型 */ x, long double y...
#include <iostream> #include <limits> #include <cmath> #include <cfenv> int main() { std::cout << "Tinyness before: " << std::boolalpha << std::numeric_limits<double>::tinyness_before << '\n'; double denorm_max = std::nextafter(std::numeric_limits<double>::min(), 0); doub...
abs(int)labsllabs (C++11) 计算整数值的绝对值(|x||x|) (函数) div(int)ldivlldiv (C++11) 计算整数除法的商和余数 (函数) 在标头<cinttypes>定义 abs(std::intmax_t)imaxabs (C++11)(C++11) 计算整数值的绝对值(|x||x|) (函数)
++i) { std::cout << " max_digits10:" << std::setprecision(max_digits10) << value << '\n' << "submax_digits10:" << std::setprecision(submax_digits10) << value << '\n' << '\n'; value = std::nextafter(value, std::numeric_limits<decltype(value)>::max()); } std::...
It is difficult to create a distribution over the closed interval[a,b][a,b]from this distribution. Usingstd::nextafter(b,std::numeric_limits<RealType>::max())as the second parameter does not always work due to rounding error. Most existing implementations have a bug where they may occasion...
frexp modf nextafternexttoward (C++11)(C++11) copysign (C++11) Classification and comparison fpclassify (C++11) isfinite (C++11) isinf (C++11) isnan (C++11) isnormal (C++11) signbit (C++11) isgreater (C++11) isgreaterequal (C++11) isless (C++11) islessequal (C++11) islessgreater (...
-pow : pow) / fac; return sin; } int main() { std::cout << std::setprecision(10) << std::showpos << "Typical usage:\n" << "std::sin(pi/6) = " << std::sin(pi / 6) << '\n' << "your sin(pi/6) = " << your_sin(pi / 6) << '\n' << "std::sin(pi/2...
If num1 or num2 has type long double, then std::log1p(num1, num2) has the same effect as std::log1p(static_cast<long double>(num1), static_cast<long double>(num2)). Otherwise, if num1 and/or num2 has type double or an integer type, then std::log1p(num1, num2) has ...