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workaround for vc++ mistakenly calling constructor from T instead of copy constructor when T is derived from vector.

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[SVN r35553]
This commit is contained in:
Joel de Guzman
2006-10-11 12:10:06 +00:00
parent 521574b39d
commit fc434bd837
1 changed files with 25 additions and 1 deletions
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26
include/boost/fusion/sequence/container/vector/vector.hpp
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@ -16,6 +16,8 @@
#include <boost/mpl/bool.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/is_base_of.hpp>
#include <boost/detail/workaround.hpp>
namespace boost { namespace fusion
{
@ -51,9 +53,16 @@ namespace boost { namespace fusion
vector(vector<BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, U)> const& rhs)
: vec(rhs.vec) {}
vector(vector const& rhs)
: vec(rhs.vec) {}
template <typename T>
explicit vector(T const& rhs)
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
: vec(ctor_helper(rhs, is_base_of<vector, T>())) {}
#else
: vec(rhs) {}
#endif
// Expand a couple of forwarding constructors for arguments
// of type (T0), (T0, T1), (T0, T1, T2) etc. Example:
@ -117,10 +126,25 @@ namespace boost { namespace fusion
>::type
at_impl(I index) const
{
return vec.at_impl(mpl::int_<I::value>());
return vec.at_impl(mpl::int_<I::value>());
}
private:
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
static vector_n const&
ctor_helper(vector const& rhs, mpl::true_)
{
return rhs.vec;
}
template <typename T>
static T const&
ctor_helper(T const& rhs, mpl::false_)
{
return rhs;
}
#endif
vector_n vec;
};