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re PR c++/80691 (Narrowing conversion in {} allowed in a SFINAE context)

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2018-05-08  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/80691
	* g++.dg/cpp0x/narrowing1.C: New.

From-SVN: r260027
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Paolo Carlini 2018-05-08 08:55:30 +00:00 • committed by Paolo Carlini
parent 4be63d9e5e
commit 3e8f909a06
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gcc/testsuite/ChangeLog
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2018-05-08 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/80691
* g++.dg/cpp0x/narrowing1.C: New.
2018-05-08 Richard Biener <rguenther@suse.de>
PR middle-end/85588

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gcc/testsuite/g++.dg/cpp0x/narrowing1.C Normal file
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// PR c++/80691
// { dg-do compile { target c++11 } }
struct true_type { static constexpr bool value = true; };
struct false_type { static constexpr bool value = false; };
template<typename...> using void_t = void;
template<typename T> T&& declval();
template<typename T, typename U, typename = void>
struct is_nonnarrowing_conversion : false_type {};
template<typename T, typename U>
struct is_nonnarrowing_conversion<T, U,
void_t<decltype(T{ declval<U>() })>> : true_type {};
template<typename T>
class wrapper
{
public:
wrapper(T) {}
};
static_assert(!is_nonnarrowing_conversion<int, float>::value, "");
static_assert(!is_nonnarrowing_conversion<wrapper<int>, float>::value, "");