73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
// (C) Copyright John Maddock 2001.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/config for most recent version.
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// MACRO: BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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// TITLE: member template friends
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// DESCRIPTION: Member template friend syntax
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// ("template<class P> friend class frd;")
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// described in the C++ Standard,
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// 14.5.3, not supported.
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namespace boost_no_member_template_friends{
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template <class T>
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class foobar;
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template <class T>
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class foo;
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template <class T>
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bool must_be_friend_proc(const foo<T>& f);
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template <class T>
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class foo
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{
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private:
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template<typename Y> friend class foobar;
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template<typename Y> friend class foo;
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template<typename Y> friend bool must_be_friend_proc(const foo<Y>& f);
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int i;
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public:
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foo(){ i = 0; }
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template <class U>
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foo(const foo<U>& f){ i = f.i; }
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};
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template <class T>
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bool must_be_friend_proc(const foo<T>& f)
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{ return f.i != 0; }
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template <class T>
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class foobar
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{
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int i;
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public:
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template <class U>
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foobar(const foo<U>& f)
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{ i = f.i; }
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};
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int test()
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{
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foo<int> fi;
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foo<double> fd(fi);
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must_be_friend_proc(fd);
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foobar<long> fb(fi);
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(void) &fb; // avoid "unused variable" warning
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return 0;
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}
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}
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