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#pragma once
#include <ctime>
#include <functional>
#include <iomanip>
#include <sstream>
#include <variant>
#include <utility>
namespace pog {
template <typename InputIterator, typename OutputIterator, typename UnaryOperator, typename Pred>
OutputIterator transform_if(InputIterator first1, InputIterator last1, OutputIterator result, Pred pred, UnaryOperator op)
{
while (first1 != last1)
{
if (pred(*first1)) {
*result = op(*first1);
++result;
}
++first1;
}
return result;
}
template <typename InputIterator, typename T, typename BinaryOperation, typename Pred>
T accumulate_if(InputIterator first, InputIterator last, T init, Pred pred, BinaryOperation op)
{
for (; first != last; ++first)
{
if (pred(*first))
init = op(std::move(init), *first);
}
return init;
}
inline void hash_combine(std::size_t&) { }
template <typename T, typename... Rest>
inline void hash_combine(std::size_t& seed, const T& v, const Rest&... rest) {
seed ^= std::hash<T>{}(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
hash_combine(seed, rest...);
}
template <typename... Rest>
inline std::size_t hash_combine(const Rest&... rest)
{
std::size_t seed = 0;
hash_combine(seed, rest...);
return seed;
}
template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
template <typename Variant, typename... Fs>
auto visit_with(Variant& v, Fs&&... fs)
{
return std::visit(overloaded{
std::forward<Fs>(fs)...
}, v);
}
template <typename FormatT>
inline std::string current_time(FormatT&& format)
{
auto now = std::time(nullptr);
auto tm = std::localtime(&now);
std::ostringstream ss;
ss << std::put_time(tm, std::forward<FormatT>(format));
return ss.str();
}
} // namespace pog
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