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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
// template <class T> constexpr bool operator<= (const optional<T>& x, const optional<T>& y);
#include <optional>
using std::optional;
struct X {
int i_;
constexpr X(int i) : i_(i) {}
};
constexpr bool operator<=(const X& lhs, const X& rhs) {
return lhs.i_ <= rhs.i_;
}
int main() {
{
typedef optional<X> O;
constexpr O o1; // disengaged
constexpr O o2; // disengaged
constexpr O o3{1}; // engaged
constexpr O o4{2}; // engaged
constexpr O o5{1}; // engaged
static_assert((o1 <= o1), "");
static_assert((o1 <= o2), "");
static_assert((o1 <= o3), "");
static_assert((o1 <= o4), "");
static_assert((o1 <= o5), "");
static_assert((o2 <= o1), "");
static_assert((o2 <= o2), "");
static_assert((o2 <= o3), "");
static_assert((o2 <= o4), "");
static_assert((o2 <= o5), "");
static_assert(!(o3 <= o1), "");
static_assert(!(o3 <= o2), "");
static_assert((o3 <= o3), "");
static_assert((o3 <= o4), "");
static_assert((o3 <= o5), "");
static_assert(!(o4 <= o1), "");
static_assert(!(o4 <= o2), "");
static_assert(!(o4 <= o3), "");
static_assert((o4 <= o4), "");
static_assert(!(o4 <= o5), "");
static_assert(!(o5 <= o1), "");
static_assert(!(o5 <= o2), "");
static_assert((o5 <= o3), "");
static_assert((o5 <= o4), "");
static_assert((o5 <= o5), "");
}
{
using O1 = optional<int>;
using O2 = optional<long>;
constexpr O1 o1(42);
static_assert(o1 <= O2(42), "");
static_assert(!(O2(101) <= o1), "");
}
{
using O1 = optional<int>;
using O2 = optional<const int>;
constexpr O1 o1(42);
static_assert(o1 <= O2(42), "");
static_assert(!(O2(101) <= o1), "");
}
}
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