49 lines
1.0 KiB
C++
49 lines
1.0 KiB
C++
//===----------------------------------------------------------------------===//
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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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// <memory>
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// template <class Ptr>
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// struct pointer_traits
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// {
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// static pointer pointer_to(<details>);
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// ...
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// };
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#include <memory>
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#include <cassert>
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template <class T>
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struct A
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{
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private:
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struct nat {};
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public:
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typedef T element_type;
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element_type* t_;
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A(element_type* t) : t_(t) {}
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static A pointer_to(typename std::conditional<std::is_void<element_type>::value,
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nat, element_type>::type& et)
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{return A(&et);}
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};
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int main()
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{
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{
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int i = 0;
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A<int> a = std::pointer_traits<A<int> >::pointer_to(i);
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assert(a.t_ = &i);
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}
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{
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(std::pointer_traits<A<void> >::element_type)0;
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}
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}
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