solvespace/src/handle.h at master · solvespace/solvespace · GitHub

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#ifndef SOVLESPACE_HANDLE_H

#define SOVLESPACE_HANDLE_H

#include <functional>

#include <type_traits>

namespace SolveSpace {

/// Trait indicating which types are handle types and should get the associated operators.

/// Specialize for each handle type and inherit from std::true_type.

template<class T>

struct IsHandleOracle : std::false_type {};

// Equality-compare any two instances of a handle type.

template<class T>

static inline typename std::enable_if<IsHandleOracle<T>::value, bool>::type

operator==(T const &lhs, T const &rhs) {

return lhs.v == rhs.v;

}

// Inequality-compare any two instances of a handle type.

template<class T>

static inline typename std::enable_if<IsHandleOracle<T>::value, bool>::type

operator!=(T const &lhs, T const &rhs) {

return !(lhs == rhs);

}

// Less-than-compare any two instances of a handle type.

template<class T>

static inline typename std::enable_if<IsHandleOracle<T>::value, bool>::type

operator<(T const &lhs, T const &rhs) {

return lhs.v < rhs.v;

}

template<class T>

struct HandleHasher {

static_assert(IsHandleOracle<T>::value, "Not a valid handle type");

inline size_t operator()(const T &h) const {

using Hasher = std::hash<decltype(T::v)>;

return Hasher{}(h.v);

}

};

} // namespace SolveSpace

#endif // !SOVLESPACE_HANDLE_H

solvespace/src/handle.h at master · solvespace/solvespace · GitHub

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