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- //////////////////////////////////////////////////////////////////////////////
- //
- // (C) Copyright Ion Gaztanaga 2014-2014.
- // Distributed under 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/move for documentation.
- //
- //////////////////////////////////////////////////////////////////////////////
- #include <boost/move/detail/config_begin.hpp>
- #include <boost/move/detail/meta_utils_core.hpp>
- #include <boost/move/move.hpp>
- //[template_assign_example_foo_bar
- class Foo
- {
- BOOST_COPYABLE_AND_MOVABLE(Foo)
- public:
- int i;
- explicit Foo(int val) : i(val) {}
- Foo(BOOST_RV_REF(Foo) obj) : i(obj.i) {}
- Foo& operator=(BOOST_RV_REF(Foo) rhs)
- { i = rhs.i; rhs.i = 0; return *this; }
- Foo& operator=(BOOST_COPY_ASSIGN_REF(Foo) rhs)
- { i = rhs.i; return *this; } //(1)
- template<class U> //(*) TEMPLATED ASSIGNMENT, potential problem
- //<-
- #if 1
- typename ::boost::move_detail::disable_if_same<U, Foo, Foo&>::type
- operator=(const U& rhs)
- #else
- //->
- Foo& operator=(const U& rhs)
- //<-
- #endif
- //->
- { i = -rhs.i; return *this; } //(2)
- };
- //]
- struct Bar
- {
- int i;
- explicit Bar(int val) : i(val) {}
- };
- //<-
- #ifdef NDEBUG
- #undef NDEBUG
- #endif
- //->
- #include <cassert>
- int main()
- {
- //[template_assign_example_main
- Foo foo1(1);
- //<-
- assert(foo1.i == 1);
- //->
- Foo foo2(2);
- //<-
- assert(foo2.i == 2);
- Bar bar(3);
- assert(bar.i == 3);
- //->
- foo2 = foo1; // Calls (1) in C++11 but (2) in C++98
- //<-
- assert(foo2.i == 1);
- assert(foo1.i == 1); //Fails in C++98 unless workaround is applied
- foo1 = bar;
- assert(foo1.i == -3);
- foo2 = boost::move(foo1);
- assert(foo1.i == 0);
- assert(foo2.i == -3);
- //->
- const Foo foo5(5);
- foo2 = foo5; // Calls (1) in C++11 but (2) in C++98
- //<-
- assert(foo2.i == 5); //Fails in C++98 unless workaround is applied
- assert(foo5.i == 5);
- //->
- //]
- return 0;
- }
- #include <boost/move/detail/config_end.hpp>
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