hash.h

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#pragma once
 
namespace eu::core
{
 
struct HashCombiner
{
    std::size_t result = 17;
 
    template<typename T>
    HashCombiner& combine(const T& t)
    {
        result = result * 31 + std::hash<T>{}(t);
        return *this;
    }
};
 
 
#define HASH_DEF_BEGIN(TYPE) \
    template<> \
    struct std::hash<TYPE> \
    { \
        std::size_t operator()(const TYPE& x) const \
        { \
            return eu::core::HashCombiner \
            { \
            }
 
#define HASH_DEF(NAME) .combine(x.NAME)
 
#define HASH_DEF_END() \
    .result; \
    } \
    } \
    ;
 
}  //  namespace klotter