标准库头文件 <numbers> (C++20)
来自 cppreference.com
此头文件是 数值 库的一部分。
[编辑] 数学常数 (自 C++20)
头文件 <numbers> 提供了几个数学常数,例如 std::numbers::pi 或 std::numbers::sqrt2
[编辑] 概要
namespace std::numbers { template<class T> inline constexpr T e_v = /* unspecified */; template<class T> inline constexpr T log2e_v = /* unspecified */; template<class T> inline constexpr T log10e_v = /* unspecified */; template<class T> inline constexpr T pi_v = /* unspecified */; template<class T> inline constexpr T inv_pi_v = /* unspecified */; template<class T> inline constexpr T inv_sqrtpi_v = /* unspecified */; template<class T> inline constexpr T ln2_v = /* unspecified */; template<class T> inline constexpr T ln10_v = /* unspecified */; template<class T> inline constexpr T sqrt2_v = /* unspecified */; template<class T> inline constexpr T sqrt3_v = /* unspecified */; template<class T> inline constexpr T inv_sqrt3_v = /* unspecified */; template<class T> inline constexpr T egamma_v = /* unspecified */; template<class T> inline constexpr T phi_v = /* unspecified */; template<floating_point T> inline constexpr T e_v<T> = /* see description */; template<floating_point T> inline constexpr T log2e_v<T> = /* see description */; template<floating_point T> inline constexpr T log10e_v<T> = /* see description */; template<floating_point T> inline constexpr T pi_v<T> = /* see description */; template<floating_point T> inline constexpr T inv_pi_v<T> = /* see description */; template<floating_point T> inline constexpr T inv_sqrtpi_v<T> = /* see description */; template<floating_point T> inline constexpr T ln2_v<T> = /* see description */; template<floating_point T> inline constexpr T ln10_v<T> = /* see description */; template<floating_point T> inline constexpr T sqrt2_v<T> = /* see description */; template<floating_point T> inline constexpr T sqrt3_v<T> = /* see description */; template<floating_point T> inline constexpr T inv_sqrt3_v<T> = /* see description */; template<floating_point T> inline constexpr T egamma_v<T> = /* see description */; template<floating_point T> inline constexpr T phi_v<T> = /* see description */; inline constexpr double e = e_v<double>; inline constexpr double log2e = log2e_v<double>; inline constexpr double log10e = log10e_v<double>; inline constexpr double pi = pi_v<double>; inline constexpr double inv_pi = inv_pi_v<double>; inline constexpr double inv_sqrtpi = inv_sqrtpi_v<double>; inline constexpr double ln2 = ln2_v<double>; inline constexpr double ln10 = ln10_v<double>; inline constexpr double sqrt2 = sqrt2_v<double>; inline constexpr double sqrt3 = sqrt3_v<double>; inline constexpr double inv_sqrt3 = inv_sqrt3_v<double>; inline constexpr double egamma = egamma_v<double>; inline constexpr double phi = phi_v<double>; }