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//===----------------------------------------------------------------------===//
//
// 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_map>
// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
// class Alloc = allocator<pair<const Key, T>>>
// class unordered_map
// void rehash(size_type n);
#include <unordered_map>
#include <string>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
template <class C>
void rehash_postcondition(const C& c, size_t n)
{
assert(c.bucket_count() >= c.size() / c.max_load_factor() && c.bucket_count() >= n);
}
template <class C>
void test(const C& c)
{
assert(c.size() == 4);
assert(c.at(1) == "one");
assert(c.at(2) == "two");
assert(c.at(3) == "three");
assert(c.at(4) == "four");
}
int main()
{
{
typedef std::unordered_map<int, std::string> C;
typedef std::pair<int, std::string> P;
P a[] =
{
P(1, "one"),
P(2, "two"),
P(3, "three"),
P(4, "four"),
P(1, "four"),
P(2, "four"),
};
C c(a, a + sizeof(a)/sizeof(a[0]));
test(c);
assert(c.bucket_count() >= 5);
c.rehash(3);
rehash_postcondition(c, 3);
LIBCPP_ASSERT(c.bucket_count() == 5);
test(c);
c.max_load_factor(2);
c.rehash(3);
rehash_postcondition(c, 3);
LIBCPP_ASSERT(c.bucket_count() == 3);
test(c);
c.rehash(31);
rehash_postcondition(c, 31);
LIBCPP_ASSERT(c.bucket_count() == 31);
test(c);
}
#if TEST_STD_VER >= 11
{
typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>,
min_allocator<std::pair<const int, std::string>>> C;
typedef std::pair<int, std::string> P;
P a[] =
{
P(1, "one"),
P(2, "two"),
P(3, "three"),
P(4, "four"),
P(1, "four"),
P(2, "four"),
};
C c(a, a + sizeof(a)/sizeof(a[0]));
test(c);
assert(c.bucket_count() >= 5);
c.rehash(3);
rehash_postcondition(c, 3);
LIBCPP_ASSERT(c.bucket_count() == 5);
test(c);
c.max_load_factor(2);
c.rehash(3);
rehash_postcondition(c, 3);
LIBCPP_ASSERT(c.bucket_count() == 3);
test(c);
c.rehash(31);
rehash_postcondition(c, 31);
LIBCPP_ASSERT(c.bucket_count() == 31);
test(c);
}
#endif
}
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