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#pragma once
#include "typetraits.h"
#include <algorithm>
#include <initializer_list>
template <class I, class T>
constexpr bool IsIn(I f, I l, const T& v);
template <class C, class T>
constexpr bool IsIn(const C& c, const T& e);
namespace NIsInHelper {
Y_HAS_MEMBER(find, FindMethod);
Y_HAS_SUBTYPE(const_iterator, ConstIterator);
Y_HAS_SUBTYPE(key_type, KeyType);
template <class T>
using TIsAssocCont = TConjunction<THasFindMethod<T>, THasConstIterator<T>, THasKeyType<T>>;
template <class C, class T, bool isAssoc>
struct TIsInTraits {
static constexpr bool IsIn(const C& c, const T& e) {
using std::begin;
using std::end;
return ::IsIn(begin(c), end(c), e);
}
};
template <class C, class T>
struct TIsInTraits<C, T, true> {
static constexpr bool IsIn(const C& c, const T& e) {
return c.find(e) != c.end();
}
};
} // namespace NIsInHelper
template <class I, class T>
constexpr bool IsIn(I f, I l, const T& v) {
return std::find(f, l, v) != l;
}
template <class C, class T>
constexpr bool IsIn(const C& c, const T& e) {
using namespace NIsInHelper;
return TIsInTraits<C, T, TIsAssocCont<C>::value>::IsIn(c, e);
}
template <class T, class U>
constexpr bool IsIn(std::initializer_list<T> l, const U& e) {
return ::IsIn(l.begin(), l.end(), e);
}
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