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add std::hash specialization for mapnik::value

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artemp 2015-06-18 10:10:26 +02:00
parent 4fe3c87a84
commit b9ed80ecc8
1 changed files with 13 additions and 0 deletions
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13
include/mapnik/value_hash.hpp
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@ -76,4 +76,17 @@ std::size_t mapnik_hash_value(T const& val)
} // namespace mapnik
// support for std::unordered containers
namespace std
{
template <>
struct hash<mapnik::value>
{
size_t operator()(const mapnik::value& val) const
{
return mapnik::mapnik_hash_value(val);
}
};
#endif // MAPNIK_VALUE_HASH_HPP