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- // (C) Copyright Jeremy Siek 1999.
- // (C) Copyright David Abrahams 1999.
- // (C) Copyright John Maddock 2001.
- // Use, modification and distribution are subject to the
- // Boost Software License, Version 1.0. (See accompanying file
- // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- // See http://www.boost.org/libs/config for most recent version.
- // MACRO: BOOST_NO_OPERATORS_IN_NAMESPACE
- // TITLE: friend operators in namespace
- // DESCRIPTION: Compiler requires inherited operator
- // friend functions to be defined at namespace scope,
- // then using'ed to boost.
- // Probably GCC specific. See boost/operators.hpp for example.
- namespace boost{
- //
- // the following is taken right out of <boost/operators.hpp>
- //
- template <class T>
- struct addable1
- {
- friend T operator+(T x, const T& y) { return x += y; }
- friend bool operator != (const T& a, const T& b) { return !(a == b); }
- };
- struct spoiler1
- {};
- spoiler1 operator+(const spoiler1&,const spoiler1&);
- bool operator !=(const spoiler1&, const spoiler1&);
- } // namespace boost
- namespace boost_no_operators_in_namespace{
- struct spoiler2
- {};
- spoiler2 operator+(const spoiler2&,const spoiler2&);
- bool operator !=(const spoiler2&, const spoiler2&);
- class add : public boost::addable1<add>
- {
- int val;
- public:
- add(int i) { val = i; }
- add(const add& a){ val = a.val; }
- add& operator+=(const add& a) { val += a.val; return *this; }
- bool operator==(const add& a)const { return val == a.val; }
- };
- int test()
- {
- add a1(2);
- add a2(3);
- add a3(0);
- a3 = a1 + a2;
- bool b1 = (a1 == a2);
- b1 = (a1 != a2);
- (void)b1;
- return 0;
- }
- }
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