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
//
//===----------------------------------------------------------------------===//
// <set>
// UNSUPPORTED: 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>>>
// set(InputIterator, InputIterator,
// Compare = Compare(), Allocator = Allocator())
// -> set<iter-value-type<InputIterator>, Compare, Allocator>;
// template<class Key, class Compare = less<Key>,
// class Allocator = allocator<Key>>
// set(initializer_list<Key>, Compare = Compare(), Allocator = Allocator())
// -> set<Key, Compare, Allocator>;
// template<class InputIterator, class Allocator>
// set(InputIterator, InputIterator, Allocator)
// -> set<iter-value-type<InputIterator>,
// less<iter-value-type<InputIterator>>, Allocator>;
// template<class Key, class Allocator>
// set(initializer_list<Key>, Allocator)
// -> set<Key, less<Key>, Allocator>;
#include <functional>
#include <set>
#include <type_traits>
struct NotAnAllocator {
friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
};
int main(int, char **) {
{
// cannot deduce Key from nothing
std::set s;
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'set'}}
}
{
// cannot deduce Key from just (Compare)
std::set s(std::less<int>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'set'}}
}
{
// cannot deduce Key from just (Compare, Allocator)
std::set s(std::less<int>{}, std::allocator<int>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'set'}}
}
{
// cannot deduce Key from just (Allocator)
std::set s(std::allocator<int>{});
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'set'}}
}
{
// since we have parens, not braces, this deliberately does not find the
// initializer_list constructor
NotAnAllocator a;
std::set s(a);
// expected-error@-1{{no viable constructor or deduction guide for deduction of template arguments of 'set'}}
}
return 0;
}