117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <optional>
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// template <class U, class... Args>
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// void optional<T>::emplace(initializer_list<U> il, Args&&... args);
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#include <experimental/optional>
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#include <type_traits>
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#include <cassert>
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#include <vector>
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#if _LIBCPP_STD_VER > 11
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using std::experimental::optional;
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class X
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{
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int i_;
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int j_ = 0;
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public:
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static bool dtor_called;
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constexpr X() : i_(0) {}
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constexpr X(int i) : i_(i) {}
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constexpr X(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) {}
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~X() {dtor_called = true;}
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friend constexpr bool operator==(const X& x, const X& y)
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{return x.i_ == y.i_ && x.j_ == y.j_;}
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};
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bool X::dtor_called = false;
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class Y
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{
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int i_;
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int j_ = 0;
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public:
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constexpr Y() : i_(0) {}
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constexpr Y(int i) : i_(i) {}
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constexpr Y(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1]) {}
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friend constexpr bool operator==(const Y& x, const Y& y)
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{return x.i_ == y.i_ && x.j_ == y.j_;}
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};
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class Z
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{
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int i_;
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int j_ = 0;
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public:
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static bool dtor_called;
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constexpr Z() : i_(0) {}
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constexpr Z(int i) : i_(i) {}
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constexpr Z(std::initializer_list<int> il) : i_(il.begin()[0]), j_(il.begin()[1])
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{throw 6;}
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~Z() {dtor_called = true;}
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friend constexpr bool operator==(const Z& x, const Z& y)
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{return x.i_ == y.i_ && x.j_ == y.j_;}
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};
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bool Z::dtor_called = false;
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#endif // _LIBCPP_STD_VER > 11
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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{
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X x;
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{
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optional<X> opt(x);
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assert(X::dtor_called == false);
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opt.emplace({1, 2});
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assert(X::dtor_called == true);
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assert(*opt == X({1, 2}));
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}
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}
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{
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optional<std::vector<int>> opt;
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opt.emplace({1, 2, 3}, std::allocator<int>());
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assert(static_cast<bool>(opt) == true);
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assert(*opt == std::vector<int>({1, 2, 3}));
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}
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{
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optional<Y> opt;
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opt.emplace({1, 2});
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assert(static_cast<bool>(opt) == true);
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assert(*opt == Y({1, 2}));
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}
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{
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Z z;
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optional<Z> opt(z);
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try
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{
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assert(static_cast<bool>(opt) == true);
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assert(Z::dtor_called == false);
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opt.emplace({1, 2});
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}
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catch (int i)
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{
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assert(i == 6);
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assert(static_cast<bool>(opt) == false);
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assert(Z::dtor_called == true);
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}
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}
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#endif // _LIBCPP_STD_VER > 11
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}
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