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2fac2d790f
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@333251 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.0 KiB
C++
39 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <optional>
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// UNSUPPORTED: libcpp-no-deduction-guides
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// template<class T>
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// optional(T) -> optional<T>;
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#include <optional>
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#include <cassert>
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struct A {};
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int main()
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{
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// Test the explicit deduction guides
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// Test the implicit deduction guides
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{
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// optional()
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std::optional opt; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'optional'}}
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}
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{
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// optional(nullopt_t)
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std::optional opt(std::nullopt); // expected-error-re@optional:* {{static_assert failed{{.*}} "instantiation of optional with nullopt_t is ill-formed"}}
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}
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}
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