74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
// (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;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|