deduct.fail.cpp
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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
//
//===----------------------------------------------------------------------===//
// <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-10.0.0
// clang-6 gives different error messages.
// template<class InputIterator,
// class Compare = less<iter-value-type<InputIterator>>,
// class Allocator = allocator<iter-value-type<InputIterator>>>
// multimap(InputIterator, InputIterator,
// Compare = Compare(), Allocator = Allocator())
// -> multimap<iter-value-type<InputIterator>, Compare, Allocator>;
// template<class Key, class Compare = less<Key>, class Allocator = allocator<Key>>
// multimap(initializer_list<Key>, Compare = Compare(), Allocator = Allocator())
// -> multimap<Key, Compare, Allocator>;
// template<class InputIterator, class Allocator>
// multimap(InputIterator, InputIterator, Allocator)
// -> multimap<iter-value-type<InputIterator>, less<iter-value-type<InputIterator>>, Allocator>;
// template<class Key, class Allocator>
// multimap(initializer_list<Key>, Allocator)
// -> multimap<Key, less<Key>, Allocator>;
#include <climits> // INT_MAX
#include <functional>
#include <map>
#include <type_traits>
struct NotAnAllocator {
friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
};
using P = std::pair<int, long>;
using PC = std::pair<const int, long>;
int main(int, char**)
{
{
// cannot deduce Key and T from nothing
std::multimap m; // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce Key and T from just (Compare)
std::multimap m(std::less<int>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce Key and T from just (Compare, Allocator)
std::multimap m(std::less<int>{}, std::allocator<PC>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce Key and T from just (Allocator)
std::multimap m(std::allocator<PC>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// refuse to rebind the allocator if Allocator::value_type is not exactly what we expect
const P arr[] = { {1,1L}, {2,2L}, {3,3L} };
std::multimap m(arr, arr + 3, std::allocator<P>());
// expected-error-re@map:* {{static_assert failed{{( due to requirement '.*')?}} "Allocator::value_type must be same type as value_type"}}
}
{
// cannot convert from some arbitrary unrelated type
NotAnAllocator a;
std::multimap m(a); // expected-error{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce that the inner braced things should be std::pair and not something else
std::multimap m{ {1,1L}, {2,2L}, {3,3L} };
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce that the inner braced things should be std::pair and not something else
std::multimap m({ {1,1L}, {2,2L}, {3,3L} }, std::less<int>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce that the inner braced things should be std::pair and not something else
std::multimap m({ {1,1L}, {2,2L}, {3,3L} }, std::less<int>(), std::allocator<PC>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// cannot deduce that the inner braced things should be std::pair and not something else
std::multimap m({ {1,1L}, {2,2L}, {3,3L} }, std::allocator<PC>());
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// since we have parens, not braces, this deliberately does not find the initializer_list constructor
std::multimap m(P{1,1L});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
{
// since we have parens, not braces, this deliberately does not find the initializer_list constructor
std::multimap m(PC{1,1L});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'multimap'}}
}
return 0;
}