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/*
* Copyright (c) 2003-2012, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @addtogroup util
*/
/**
* @file accum.h
* @author John Wiegley
*
* @ingroup util
*/
#ifndef _ACCUM_H
#define _ACCUM_H
namespace ledger {
class straccbuf : public std::streambuf
{
protected:
std::string str; // accumulator
std::string::size_type index;
public:
straccbuf() : index(0) {}
protected:
virtual std::streamsize xsputn(const char * s, std::streamsize num);
friend class straccstream;
};
class straccstream : public std::ostream
{
protected:
straccbuf buf;
public:
straccstream() : std::ostream(0) {
rdbuf(&buf);
}
void clear() {
std::ostream::clear();
buf.pubseekoff(0, ios_base::beg);
buf.str.clear();
buf.index = 0;
}
std::string str() const {
return buf.str;
}
};
#define ACCUM(obj) (static_cast<const straccstream&>(obj).str())
extern straccstream _accum;
extern std::ostringstream _accum_buffer;
inline string str_helper_func() {
string buf = _accum_buffer.str();
_accum_buffer.clear();
_accum_buffer.str("");
return buf;
}
#define STR(msg) \
((_accum_buffer << ACCUM(_accum << msg)), \
_accum.clear(), str_helper_func())
} // namespace ledger
#endif // _ACCUM_H
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