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Fix warnings with gcc 4.4 in C++11 mode

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GCC 4.4 has support for an early draft of rvalue references. When compiling the conforming code it produces warnings such as '../boost/optional/optional.hpp:152: warning: returning reference to temporary'. In order to fix this regression use a special implementation of move(), similar to std::move() on this compiler.
This commit is contained in:
Andrey Semashev
2014-05-22 10:15:11 +04:00
parent e9f5ed41be
commit 5e59e10f93
1 changed files with 6 additions and 0 deletions
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include/boost/optional/optional.hpp
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@ -149,7 +149,13 @@ struct types_when_isnt_ref
typedef T & reference_type ; typedef T & reference_type ;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
typedef T && rval_reference_type ; typedef T && rval_reference_type ;
#ifdef BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES
// GCC 4.4 has support for an early draft of rvalue references. The conforming version below
// causes warnings about returning references to a temporary.
static T&& move(T&& r) { return r; }
#else
static rval_reference_type move(reference_type r) { return boost::move(r); } static rval_reference_type move(reference_type r) { return boost::move(r); }
#endif
#endif #endif
typedef T const* pointer_const_type ; typedef T const* pointer_const_type ;
typedef T * pointer_type ; typedef T * pointer_type ;