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Sqrt with algorithm for integer for C++
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| #ifndef SQRT_HPP | |
| #define SQRT_HPP | |
| #include <type_traits> | |
| template <typename T> | |
| constexpr T sqrt(T value) { | |
| if constexpr (std::is_integral_v<T>) { | |
| T op = value; | |
| T res = 0; | |
| T one = (T)1 << ((sizeof(T) * 8 - 1) & -2); | |
| while (one > op) one >>= 2; | |
| while (one) { | |
| if (op >= (res + one)) { | |
| op -= res + one; | |
| res = (res >> 1) + one; | |
| } else { | |
| res >>= 1; | |
| } | |
| one >>= 2; | |
| } | |
| return res; | |
| } else if constexpr (std::is_same_v<T, double>) { | |
| return __builtin_sqrt(value); | |
| } else if constexpr (std::is_same_v<T, float>) { | |
| return __builtin_sqrtf(value); | |
| } else if constexpr (std::is_same_v<T, long double>) { | |
| return __builtin_sqrtl(value); | |
| } else { | |
| static_assert(sizeof(T) & 0, "Argument is not a number"); | |
| } | |
| } | |
| #endif |
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