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Implement LWG 2711. Constrain path members.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@279945 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-08-28 21:26:01 +00:00
parent d3169f5a4e
commit 113315b9a4
7 changed files with 211 additions and 12 deletions
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44
test/std/experimental/filesystem/class.path/path.member/path.assign/source.pass.cpp
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@@ -170,6 +170,49 @@ void RunTestCase(MultiStringType const& MS) {
}
}
template <class It, class = decltype(fs::path{}.assign(std::declval<It>()))>
constexpr bool has_assign(int) { return true; }
template <class It>
constexpr bool has_assign(long) { return false; }
template <class It>
constexpr bool has_assign() { return has_assign<It>(0); }
void test_sfinae() {
using namespace fs;
{
using It = const char* const;
static_assert(std::is_assignable<path, It>::value, "");
static_assert(has_assign<It>(), "");
}
{
using It = input_iterator<const char*>;
static_assert(std::is_assignable<path, It>::value, "");
static_assert(has_assign<It>(), "");
}
{
struct Traits {
using iterator_category = std::input_iterator_tag;
using value_type = const char;
using pointer = const char*;
using reference = const char&;
using difference_type = std::ptrdiff_t;
};
using It = input_iterator<const char*, Traits>;
static_assert(std::is_assignable<path, It>::value, "");
static_assert(has_assign<It>(), "");
}
{
using It = output_iterator<const char*>;
static_assert(!std::is_assignable<path, It>::value, "");
static_assert(!has_assign<It>(), "");
}
{
static_assert(!std::is_assignable<path, int*>::value, "");
static_assert(!has_assign<int*>(), "");
}
}
int main() {
for (auto const& MS : PathList) {
RunTestCase<char>(MS);
@@ -177,4 +220,5 @@ int main() {
RunTestCase<char16_t>(MS);
RunTestCase<char32_t>(MS);
}
test_sfinae();
}