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afabri/mpz_cpp_int.cpp

Last active May 2, 2024 09:00
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Speed difference between mpz_int and cpp_int for function convert_to<std::string>
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mpz_cpp_int.cpp
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/gmp.hpp>
#include <chrono>
#include <iostream>
#include <string>
template <typename Number>
void fct(const std::string& forth)
{
const auto start{ std::chrono::steady_clock::now() };
Number big_int(forth);
std::string back = big_int. template convert_to<std::string>();
const auto end{ std::chrono::steady_clock::now() };
if (forth.length() != back.length()) {
std::cerr << "error" << std::endl;
}
const std::chrono::duration<double> elapsed_seconds{ end - start };
std::cout << elapsed_seconds.count() << " sec." << std::endl;
}
int main()
{
using namespace boost::multiprecision;
std::string ten("1234567890");
std::string forth;
for (int i = 0; i < 10000; ++i) {
forth += ten;
}
std::cout << "number of digits: " << forth.length() << std::endl;
fct<mpz_int>(forth);
fct<cpp_int>(forth);
return 0;
}
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