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String Algorithm Library: initial commit

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[SVN r22431]
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Pavol Droba
2004-03-04 22:12:19 +00:00
parent 3d9b6badea
commit 1deef19d55
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183
include/boost/algorithm/string/detail/sequence.hpp Normal file
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// Boost string_algo library sequence.hpp header file ---------------------------//
// Copyright Pavol Droba 2002-2003. Use, modification and
// distribution is subject to 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 for updates, documentation, and revision history.
#ifndef BOOST_STRING_DETAIL_SEQUENCE_HPP
#define BOOST_STRING_DETAIL_SEQUENCE_HPP
#include <boost/algorithm/string/config.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/logical.hpp>
#include <boost/algorithm/string/collection_traits.hpp>
#include <boost/algorithm/string/sequence_traits.hpp>
namespace boost {
namespace algorithm {
namespace detail {
// insert helpers -------------------------------------------------//
template< typename InputT, typename InsertT >
inline void insert(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator At,
const InsertT& Insert )
{
insert( Input, At, begin(Insert), end(Insert) );
}
template< typename InputT, typename ForwardIteratorT >
inline void insert(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator At,
ForwardIteratorT Begin,
ForwardIteratorT End )
{
Input.insert( At, Begin, End );
}
// erase helper ---------------------------------------------------//
// Erase a range in the sequence
/*
Returns the iterator pointing just after the erase subrange
*/
template< typename InputT >
inline typename InputT::iterator erase(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To )
{
return Input.erase( From, To );
}
// replace helper implementation ----------------------------------//
// Optimized version of replace for generic sequence containers
// Assumption: insert and erase are expensive
template< bool HasConstTimeOperations >
struct replace_const_time_helper
{
template< typename InputT, typename ForwardIteratorT >
void operator()(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To,
ForwardIteratorT Begin,
ForwardIteratorT End )
{
// Copy data to the container ( as much as possible )
ForwardIteratorT InsertIt=Begin;
BOOST_STRING_TYPENAME InputT::iterator InputIt=From;
for(; InsertIt!=End && InputIt!=To; InsertIt++, InputIt++ )
{
*InputIt=*InsertIt;
}
if ( InsertIt!=End )
{
// Replace sequence is longer, insert it
Input.insert( InputIt, InsertIt, End );
}
else
{
if ( InputIt!=To )
{
// Replace sequence is shorter, erase the rest
Input.erase( InputIt, To );
}
}
}
};
template<>
struct replace_const_time_helper< true >
{
// Const-time erase and insert methods -> use them
template< typename InputT, typename ForwardIteratorT >
void operator()(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To,
ForwardIteratorT Begin,
ForwardIteratorT End )
{
BOOST_STRING_TYPENAME InputT::iterator At=Input.erase( From, To );
if ( Begin!=End )
{
Input.insert( At, Begin, End );
}
}
};
// No native replace method
template< bool HasNative >
struct replace_native_helper
{
template< typename InputT, typename ForwardIteratorT >
void operator()(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To,
ForwardIteratorT Begin,
ForwardIteratorT End )
{
replace_const_time_helper<
boost::mpl::and_<
has_const_time_insert<InputT>,
has_const_time_erase<InputT> >::value >()(
Input, From, To, Begin, End );
}
};
// Container has native replace method
template<>
struct replace_native_helper< true >
{
template< typename InputT, typename ForwardIteratorT >
void operator()(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To,
ForwardIteratorT Begin,
ForwardIteratorT End )
{
Input.replace( From, To, Begin, End );
}
};
// replace helper -------------------------------------------------//
template< typename InputT, typename InsertT >
inline void replace(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To,
const InsertT& Insert )
{
replace( Input, From, To, begin(Insert), end(Insert) );
}
template< typename InputT, typename ForwardIteratorT >
inline void replace(
InputT& Input,
BOOST_STRING_TYPENAME InputT::iterator From,
BOOST_STRING_TYPENAME InputT::iterator To,
ForwardIteratorT Begin,
ForwardIteratorT End )
{
replace_native_helper< has_native_replace<InputT>::value >()(
Input, From, To, Begin, End );
};
} // namespace detail
} // namespace algorithm
} // namespace boost
#endif // BOOST_STRING_DETAIL_SEQUENCE_HPP