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#include <cybozu/util.hpp>
#include <typeinfo>
#include <chrono>
#include <iostream>
typedef std::chrono::microseconds us_t;
template <typename T>
inline us_t::rep to_us(T start, T end) {
return std::chrono::duration_cast<us_t>(end-start).count();
}
template <typename T>
inline void print_ratio() {
cybozu::demangler t(typeid(T).name());
std::cout << t.name() << " ratio = "
<< T::period::num << "/" << T::period::den
<< " second." << std::endl;
}
int main() {
auto t1 = std::chrono::steady_clock::now();
print_ratio<std::chrono::system_clock>();
print_ratio<std::chrono::steady_clock>();
print_ratio<std::chrono::high_resolution_clock>();
std::cout << "std::chrono::high_resolution_clock is "
<< (std::chrono::high_resolution_clock::is_steady ? "" : "not ")
<< "steady." << std::endl;
static_assert(std::chrono::steady_clock::is_steady,
"std::chrono::steady_clock is not steady!");
auto t2 = std::chrono::steady_clock::now();
std::cout << "t2 - t1 = "
<< to_us(t1, t2) << "us"
<< std::endl;
return 0;
}
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