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Disable boost::swap for const objects. Fixes #43.

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This commit is contained in:
Peter Dimov
2018-10-24 12:23:56 +03:00
parent e9f986d11e
commit a5c891441c
1 changed files with 9 additions and 2 deletions
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11
include/boost/core/swap.hpp
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@ -21,13 +21,19 @@
// avoid ambiguity when swapping objects of a Boost type that does // avoid ambiguity when swapping objects of a Boost type that does
// not have its own boost::swap overload. // not have its own boost::swap overload.
#include <boost/core/enable_if.hpp>
#include <boost/config.hpp>
#include <utility> //for std::swap (C++11) #include <utility> //for std::swap (C++11)
#include <algorithm> //for std::swap (C++98) #include <algorithm> //for std::swap (C++98)
#include <cstddef> //for std::size_t #include <cstddef> //for std::size_t
#include <boost/config.hpp>
namespace boost_swap_impl namespace boost_swap_impl
{ {
// we can't use type_traits here
template<class T> struct is_const { enum _vt { value = 0 }; };
template<class T> struct is_const<T const> { enum _vt { value = 1 }; };
template<class T> template<class T>
BOOST_GPU_ENABLED BOOST_GPU_ENABLED
void swap_impl(T& left, T& right) void swap_impl(T& left, T& right)
@ -51,7 +57,8 @@ namespace boost
{ {
template<class T1, class T2> template<class T1, class T2>
BOOST_GPU_ENABLED BOOST_GPU_ENABLED
void swap(T1& left, T2& right) typename enable_if_c< !boost_swap_impl::is_const<T1>::value && !boost_swap_impl::is_const<T2>::value >::type
swap(T1& left, T2& right)
{ {
::boost_swap_impl::swap_impl(left, right); ::boost_swap_impl::swap_impl(left, right);
} }