cxx/test/containers/unord/unord.set/bucket.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <unordered_set>

// template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
//           class Alloc = allocator<Value>>
// class unordered_set

// size_type bucket(const key_type& __k) const;

#include <unordered_set>
#include <cassert>

int main()
{
    {
        typedef std::unordered_set<int> C;
        typedef int P;
        P a[] =
        {
            P(1),
            P(2),
            P(3),
            P(4),
            P(1),
            P(2)
        };
        const C c(std::begin(a), std::end(a));
        size_t bc = c.bucket_count();
        assert(bc >= 5);
        for (size_t i = 0; i < 13; ++i)
            assert(c.bucket(i) == i % bc);
    }
}