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74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
// (C) Copyright Jeremy Siek 1999.
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// (C) Copyright David Abrahams 1999.
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// (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_OPERATORS_IN_NAMESPACE
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// TITLE: friend operators in namespace
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// DESCRIPTION: Compiler requires inherited operator
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// friend functions to be defined at namespace scope,
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// then using'ed to boost.
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// Probably GCC specific. See boost/operators.hpp for example.
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namespace boost{
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//
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// the following is taken right out of <boost/operators.hpp>
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//
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template <class T>
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struct addable1
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{
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friend T operator+(T x, const T& y) { return x += y; }
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friend bool operator != (const T& a, const T& b) { return !(a == b); }
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};
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struct spoiler1
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{};
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spoiler1 operator+(const spoiler1&,const spoiler1&);
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bool operator !=(const spoiler1&, const spoiler1&);
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} // namespace boost
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namespace boost_no_operators_in_namespace{
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struct spoiler2
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{};
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spoiler2 operator+(const spoiler2&,const spoiler2&);
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bool operator !=(const spoiler2&, const spoiler2&);
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class add : public boost::addable1<add>
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{
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int val;
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public:
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add(int i) { val = i; }
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add(const add& a){ val = a.val; }
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add& operator+=(const add& a) { val += a.val; return *this; }
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bool operator==(const add& a)const { return val == a.val; }
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};
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int test()
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{
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add a1(2);
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add a2(3);
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add a3(0);
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a3 = a1 + a2;
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bool b1 = (a1 == a2);
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b1 = (a1 != a2);
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(void)b1;
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return 0;
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}
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}
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