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#pragma once
#include <util/generic/typetraits.h>
#include <util/str_stl.h>
namespace NThreading {
namespace NImpl {
Y_HAS_MEMBER(compare);
Y_HAS_MEMBER(Compare);
template <typename T>
inline int CompareImpl(const T& l, const T& r) {
if (l < r) {
return -1;
} else if (r < l) {
return +1;
} else {
return 0;
}
}
template <bool val>
struct TSmallCompareSelector {
template <typename T>
static inline int Compare(const T& l, const T& r) {
return CompareImpl(l, r);
}
};
template <>
struct TSmallCompareSelector<true> {
template <typename T>
static inline int Compare(const T& l, const T& r) {
return l.compare(r);
}
};
template <bool val>
struct TBigCompareSelector {
template <typename T>
static inline int Compare(const T& l, const T& r) {
return TSmallCompareSelector<THascompare<T>::value>::Compare(l, r);
}
};
template <>
struct TBigCompareSelector<true> {
template <typename T>
static inline int Compare(const T& l, const T& r) {
return l.Compare(r);
}
};
template <typename T>
struct TCompareSelector: public TBigCompareSelector<THasCompare<T>::value> {
};
}
////////////////////////////////////////////////////////////////////////////////
// Generic compare function
template <typename T>
inline int Compare(const T& l, const T& r) {
return NImpl::TCompareSelector<T>::Compare(l, r);
}
////////////////////////////////////////////////////////////////////////////////
// Generic compare functor
template <typename T>
struct TCompare {
inline int operator()(const T& l, const T& r) const {
return Compare(l, r);
}
};
}
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