libcruft-util/test/hash/tuple.cpp

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#include "hash/tuple.hpp"
#include "tap.hpp"
#include <string_view>
// A "hash" that returns the argument's size.
struct size_hash {
template <typename ValueT>
std::size_t
operator () (ValueT const &val) const
{ return std::size (val); }
};
// A 'mix' function that just sums the arguments.
struct sum_mix {
template <typename ...ValueT>
std::size_t
operator () (ValueT ...val) const
{
return (val + ...);
}
};
int
main ()
{
using namespace std::string_view_literals;
cruft::hash::tuple<size_hash, sum_mix> h;
cruft::TAP::logger tap;
tap.expect_eq (
h (
std::make_tuple (
"foo"sv, std::vector<int> (5)
)
),
8u,
"size/sum tuple hash"
);
return tap.status ();
}