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Asked: 2026-06-12T09:10:43+00:00

I’m trying to hash a 64 bit integer, uint64_t temp = …; return tr1::hash<uint64_t>(temp);

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I’m trying to hash a 64 bit integer,

uint64_t temp = ...;
return tr1::hash<uint64_t>(temp);

However I get the error,

error: no matching function for call to ‘std::tr1::hash<long long unsigned int>::hash(uint64_t&)’

Why doesn’t this work?

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1 Answer

  1. Editorial Team

    hash is a class. You have to make an object:

    return std::tr1::hash<uint64_t>()(temp);
//                            ^^^^
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