/**

* Copyright (c) 2017 HERE Europe B.V.

* See the LICENSE file in the root of this project for license details.

*/

#pragma once

#include <boost/functional/hash.hpp>

#include <cstddef>

namespace flatdata

{

/**

* Hash function for a flatdata structure.

*

* Example:

*

* std::unordered_set< flatdata::SomeStruct, flatdata::Hash > set;

* std::unordered_map< flatdata::SomeStruct, uint32_t, flatdata::Hash > map;

*

*/

struct Hash

{

template < typename T >

size_t

operator( )( const T& value ) const

{

std::size_t hash = 0;

auto data = value.data( );

auto size = value.size_in_bytes( );

for ( size_t i = 0; i < size; i++ )

{

boost::hash_combine( hash, data[ i ] );

}

return hash;

}

};

} // namespace flatdata