code. compile. run. debug. share.
#include <cmath>
#include <iostream>
#include <limits>
#include <string_view>
template <typename T>
constexpr uint32_t bitsInExponent()
{
static_assert(std::numeric_limits<T>::is_iec559);
return std::ceil(std::log2(std::numeric_limits<T>::max_exponent-std::numeric_limits<T>::min_exponent+1));
}
// outputs 15 for long double on my machine/compiler
template <typename T>
constexpr uint32_t bitsInMantissa()
{
static_assert(std::numeric_limits<T>::is_iec559);
return std::numeric_limits<T>::digits-1;
}
// outputs 63 for long double on my machine/compiler
template <typename T>
constexpr uint32_t bitsInSign()
{
return 1;
}
template <typename T>
void printFpInfo(const std::string_view& name)
{
std::cout << name << " => mant: " << bitsInMantissa<T>() << " exp: " << bitsInExponent<T>() << " footprint: " << sizeof(T)*8 << std::endl;
}
int main()
{
printFpInfo<float>("float");
printFpInfo<double>("double");
printFpInfo<long double>("long double");
return 0;
}
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