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X3.Tests: Tweak constexpr tests to work with Clang 3.6

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Clang 3.6 has some problems with aggregate initialization and `operator,`
This commit is contained in:
Nikita Kniazev
2020-03-29 20:49:19 +03:00
parent dc6f70d384
commit e44a6af723
1 changed files with 9 additions and 3 deletions
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12
test/x3/test.hpp
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@@ -121,14 +121,20 @@ namespace spirit_test
&& (!full_match || (in == last));
}
template <typename... T>
constexpr bool always_true(T&&...) { return true; }
template <typename Parser>
constexpr Parser test_ctors(Parser p)
constexpr bool test_ctors(Parser const& p)
{
return { static_cast<Parser&&>(Parser{ p }) };
return always_true(
static_cast<Parser>(static_cast<Parser&&>( // test move ctor
static_cast<Parser>(p)))); // test copy ctor
}
}
# define BOOST_SPIRIT_ASSERT_CONSTEXPR_CTORS(...) \
static_assert((::spirit_test::test_ctors(__VA_ARGS__), void(), true), "")
static_assert(::spirit_test::test_ctors(__VA_ARGS__), "")
#endif