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Update include.hh 

Signed-off-by: subcrip <contact@subc.rip>
This commit is contained in:
subcrip 2024-05-31 10:00:27 +08:00
parent 362e781459
commit 4b5dd8da79
1 changed files with 3 additions and 0 deletions
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include.hh
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@ -429,6 +429,9 @@ istream& operator>>(istream& in, MLLd& num) {
}
// miscancellous
#define functor(func) [&](auto&&... val) \
noexcept(noexcept(func(std::forward<decltype(val)>(val)...))) -> decltype(auto) \
{return func(std::forward<decltype(val)>(val)...);}
template <typename Func, typename RandomIt> void sort_by_key(RandomIt first, RandomIt last, Func extractor) {
std::sort(first, last, [&] (auto&& a, auto&& b) { return std::less<>()(extractor(a), extractor(b)); });
}