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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <unordered_map>
// UNSUPPORTED: c++98, c++03, c++11, c++14
// UNSUPPORTED: libcpp-no-deduction-guides
// XFAIL: clang-6, apple-clang-9.0, apple-clang-9.1, apple-clang-10.0
// template<class InputIterator,
// class Hash = hash<iter-key-type<InputIterator>>,
// class Pred = equal_to<iter-key-type<InputIterator>>,
// class Allocator = allocator<iter-to-alloc-type<InputIterator>>>
// unordered_map(InputIterator, InputIterator, typename see below::size_type = see below,
// Hash = Hash(), Pred = Pred(), Allocator = Allocator())
// -> unordered_map<iter-key-type<InputIterator>, iter-mapped-type<InputIterator>, Hash, Pred,
// Allocator>;
//
// template<class Key, class T, class Hash = hash<Key>,
// class Pred = equal_to<Key>, class Allocator = allocator<pair<const Key, T>>>
// unordered_map(initializer_list<pair<Key, T>>,
// typename see below::size_type = see below, Hash = Hash(),
// Pred = Pred(), Allocator = Allocator())
// -> unordered_map<Key, T, Hash, Pred, Allocator>;
//
// template<class InputIterator, class Allocator>
// unordered_map(InputIterator, InputIterator, typename see below::size_type, Allocator)
// -> unordered_map<iter-key-type<InputIterator>, iter-mapped-type<InputIterator>,
// hash<iter-key-type<InputIterator>>,
// equal_to<iter-key-type<InputIterator>>, Allocator>;
//
// template<class InputIterator, class Allocator>
// unordered_map(InputIterator, InputIterator, Allocator)
// -> unordered_map<iter-key-type<InputIterator>, iter-mapped-type<InputIterator>,
// hash<iter-key-type<InputIterator>>,
// equal_to<iter-key-type<InputIterator>>, Allocator>;
//
// template<class InputIterator, class Hash, class Allocator>
// unordered_map(InputIterator, InputIterator, typename see below::size_type, Hash, Allocator)
// -> unordered_map<iter-key-type<InputIterator>, iter-mapped-type<InputIterator>, Hash,
// equal_to<iter-key-type<InputIterator>>, Allocator>;
//
// template<class Key, class T, class Allocator>
// unordered_map(initializer_list<pair<Key, T>>, typename see below::size_type, Allocator)
// -> unordered_map<Key, T, hash<Key>, equal_to<Key>, Allocator>;
//
// template<class Key, class T, class Allocator>
// unordered_map(initializer_list<pair<Key, T>>, Allocator)
// -> unordered_map<Key, T, hash<Key>, equal_to<Key>, Allocator>;
//
// template<class Key, class T, class Hash, class Allocator>
// unordered_map(initializer_list<pair<Key, T>>, typename see below::size_type, Hash,
// Allocator)
// -> unordered_map<Key, T, Hash, equal_to<Key>, Allocator>;
#include <functional>
#include <unordered_map>
int main(int, char**)
{
using P = std::pair<const int, int>;
{
// cannot deduce Key from nothing
std::unordered_map m; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Size)
std::unordered_map m(42); // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Size, Hash)
std::unordered_map m(42, std::hash<int>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Size, Hash, Pred)
std::unordered_map m(42, std::hash<int>(), std::equal_to<int>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Size, Hash, Pred, Allocator)
std::unordered_map m(42, std::hash<int>(), std::equal_to<int>(), std::allocator<P>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Allocator)
std::unordered_map m(std::allocator<P>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Size, Allocator)
std::unordered_map m(42, std::allocator<P>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
{
// cannot deduce Key from just (Size, Hash, Allocator)
std::unordered_map m(42, std::hash<int>(), std::allocator<P>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'unordered_map'}}
}
return 0;
}
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