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// Range v3 library
//
// Copyright Eric Niebler 2014-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
#include <utility>
#include <type_traits>
#include <range/v3/utility/common_type.hpp>
#include <range/v3/utility/common_tuple.hpp>
struct B {};
struct D : B {};
struct noncopyable
{
noncopyable() = default;
noncopyable(noncopyable const &) = delete;
noncopyable(noncopyable &&) = default;
noncopyable &operator=(noncopyable const &) = delete;
noncopyable &operator=(noncopyable &&) = default;
};
struct noncopyable2 : noncopyable
{};
struct X {};
struct Y {};
struct Z {};
namespace concepts
{
template<>
struct common_type<X, Y>
{
using type = Z;
};
template<>
struct common_type<Y, X>
{
using type = Z;
};
}
template<typename T>
struct ConvTo
{
operator T();
};
// Whoops, fails:
static_assert(std::is_same<
ranges::common_type_t<ConvTo<int>, int>,
int
>::value, "");
int main()
{
using namespace ranges;
using namespace detail;
static_assert(std::is_same<common_reference_t<B &, D &>, B &>::value, "");
static_assert(std::is_same<common_reference_t<B &, D const &>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B &, D const &, D &>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B const &, D &>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B &, D &, B &, D &>, B &>::value, "");
static_assert(std::is_same<common_reference_t<B &&, D &&>, B &&>::value, "");
static_assert(std::is_same<common_reference_t<B const &&, D &&>, B const &&>::value, "");
static_assert(std::is_same<common_reference_t<B &&, D const &&>, B const &&>::value, "");
static_assert(std::is_same<common_reference_t<B &, D &&>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B &, D const &&>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B const &, D &&>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B &&, D &>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B &&, D const &>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<B const &&, D &>, B const &>::value, "");
static_assert(std::is_same<common_reference_t<int, short>, int>::value, "");
static_assert(std::is_same<common_reference_t<int, short &>, int>::value, "");
static_assert(std::is_same<common_reference_t<int &, short &>, int>::value, "");
static_assert(std::is_same<common_reference_t<int &, short>, int>::value, "");
// tricky volatile reference case
static_assert(std::is_same<common_reference_t<int &&, int volatile &>, int>::value, "");
static_assert(std::is_same<common_reference_t<int volatile &, int &&>, int>::value, "");
static_assert(std::is_same<common_reference_t<int const volatile &&, int volatile &&>, int const volatile &&>::value, "");
static_assert(std::is_same<common_reference_t<int &&, int const &, int volatile &>, int const volatile &>(), "");
// Array types?? Yup!
static_assert(std::is_same<common_reference_t<int (&)[10], int (&&)[10]>, int const(&)[10]>::value, "");
static_assert(std::is_same<common_reference_t<int const (&)[10], int volatile (&)[10]>, int const volatile(&)[10]>::value, "");
static_assert(std::is_same<common_reference_t<int (&)[10], int (&)[11]>, int *>::value, "");
// Some tests for common_pair with common_reference
static_assert(std::is_same<
common_reference_t<std::pair<int &, int &>, common_pair<int,int> const &>,
common_pair<int const &, int const &>
>::value, "");
// BUGBUG TODO Is a workaround possible?
#if !defined(__GNUC__) || __GNUC__ != 4 || __GNUC_MINOR__ > 8
static_assert(std::is_same<
common_reference_t<common_pair<int const &, int const &>, std::pair<int, int>>,
common_pair<int, int>
>::value, "");
static_assert(std::is_same<
::concepts::detail::_builtin_common_t<common_pair<int, int> const &, std::pair<int, int> &>,
std::pair<int, int> const &
>::value, "");
#endif
static_assert(std::is_same<
common_reference_t<common_pair<int, int> const &, std::pair<int, int> &>,
std::pair<int, int> const &
>::value, "");
// Some tests with noncopyable types
static_assert(std::is_same<
::concepts::detail::_builtin_common_t<noncopyable const &, noncopyable>,
noncopyable
>::value, "");
static_assert(std::is_same<
::concepts::detail::_builtin_common_t<noncopyable2 const &, noncopyable>,
noncopyable
>::value, "");
static_assert(std::is_same<
::concepts::detail::_builtin_common_t<noncopyable const &, noncopyable2>,
noncopyable
>::value, "");
static_assert(std::is_same<
common_reference_t<X &, Y const &>,
Z
>::value, "");
{
// Regression test for #367
using CP = common_pair<int, int>;
CPP_assert(same_as<common_type_t<CP, CP>, CP>);
}
}
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