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to_string fixes

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[SVN r44164]
This commit is contained in:
Emil Dotchevski
2008-04-11 03:51:06 +00:00
parent 65d278a387
commit 3c7f53176f
8 changed files with 290 additions and 121 deletions
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50
include/boost/exception/detail/is_output_streamable.hpp Normal file
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@ -0,0 +1,50 @@
//Copyright (c) 2006-2008 Emil Dotchevski and Reverge Studios, Inc.
//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)
#ifndef UUID_898984B4076411DD973EDFA055D89593
#define UUID_898984B4076411DD973EDFA055D89593
#include <ostream>
namespace
boost
{
namespace
exception_detail
{
template <bool>
struct
is_output_streamable_dispatch
{
enum e { value=1 };
};
template <>
struct
is_output_streamable_dispatch<false>
{
enum e { value=0 };
};
template <class T,class CharT,class Traits>
char operator<<( std::basic_ostream<CharT,Traits> &, T const & );
template <class T,class CharT,class Traits>
struct
is_output_streamable_impl
{
enum e { value=is_output_streamable_dispatch<1!=sizeof((*(std::basic_ostream<CharT,Traits>*)0)<<(*(T*)0))>::value };
};
}
template <class T, class CharT=char, class Traits=std::char_traits<CharT> >
struct
is_output_streamable
{
enum e { value=exception_detail::is_output_streamable_impl<T,CharT,Traits>::value };
};
}
#endif

60
include/boost/exception/to_string.hpp
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@ -6,22 +6,62 @@
#ifndef UUID_7E48761AD92811DC9011477D56D89593
#define UUID_7E48761AD92811DC9011477D56D89593
#include <boost/utility/enable_if.hpp>
#include <boost/exception/detail/is_output_streamable.hpp>
#include <sstream>
#include <string>
namespace
boost
{
namespace
{
namespace
exception_detail
{
template <bool>
struct
has_to_string_dispatch
{
enum e { value=1 };
};
template <>
struct
has_to_string_dispatch<false>
{
enum e { value=0 };
};
template <class T>
std::string
to_string( T const & x, typename enable_if< is_output_streamable<T> >::type * = 0 )
{
std::ostringstream out;
out << x;
return out.str();
}
template <class T>
std::string
to_string( T const & x )
{
std::ostringstream out;
out << x;
return out.str();
}
char to_string( T const &, typename disable_if< is_output_streamable<T> >::type * = 0 );
template <class T>
struct
has_to_string_impl
{
enum e { value=has_to_string_dispatch<1!=sizeof(to_string(*(T*)0))>::value };
};
}
template <class T>
struct
has_to_string
{
enum e { value=exception_detail::has_to_string_impl<T>::value };
};
template <class T>
std::string
to_string( T const & x, typename enable_if< is_output_streamable<T> >::type * = 0 )
{
return exception_detail::to_string(x);
}
}

58
include/boost/exception/to_string_stub.hpp
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@ -13,53 +13,6 @@
namespace
boost
{
namespace
exception_detail
{
template <bool ShiftLeftAvailable>
struct shift_left_dispatcher;
template <>
struct
shift_left_dispatcher<true>
{
template <class T,class CharT,class Traits,class Stub>
static
void
convert( std::basic_ostream<CharT,Traits> & out, T const & x, Stub )
{
out << x;
}
};
template <>
struct
shift_left_dispatcher<false>
{
template <class T,class CharT,class Traits,class Stub>
static
void
convert( std::basic_ostream<CharT,Traits> & out, T const & x, Stub s )
{
out << s(x);
}
};
namespace
shift_left_dispatch
{
template <class T,class CharT,class Traits>
char operator<<( std::basic_ostream<CharT,Traits> &, T );
template <class T,class CharT,class Traits,class Stub>
void
dispatch( std::basic_ostream<CharT,Traits> & out, T const & x, Stub s )
{
shift_left_dispatcher<1!=sizeof(out<<x)>::convert(out,x,s);
}
}
}
namespace
exception_detail
{
@ -82,26 +35,21 @@ boost
{
template <class T,class Stub>
static
std::string
std::string
convert( T const & x, Stub s )
{
std::ostringstream out;
shift_left_dispatch::dispatch(out,x,s);
return out.str();
return s(x);
}
};
namespace
to_string_dispatch
{
template <class T>
char to_string( T );
template <class T,class Stub>
std::string
dispatch( T const & x, Stub s )
{
return to_string_dispatcher<1!=sizeof(to_string(x))>::convert(x,s);
return to_string_dispatcher<has_to_string<T>::value>::convert(x,s);
}
}