AutoString.h

/*
 *  $Id$
 *  AutoString and InputString class interfaces
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2007-09, IRIT UPS.
 *
 *  OTAWA is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  OTAWA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with OTAWA; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_STRING_AUTOSTRING_H
#define ELM_STRING_AUTOSTRING_H
 
#include <elm/string/StringBuffer.h>
#include <elm/io/StringInput.h>
#ifdef ELM_TEST_AUTOSTR
#   include <elm/io.h>
#endif
 
namespace elm {
 
// AutoString class
class AutoString {
public:
    template <class T>
    inline AutoString& operator<<(const T& value)
        { buf << value; return *this; }
 
    inline operator const string(void) {
        String result = buf.toString();
        delete this;
        return result;
    }
 
    // Debugging
    #ifdef ELM_TEST_AUTOSTR
        inline AutoString(void) { cout << "allocated " << this << io::endl; }
        inline ~AutoString(void) { cout << "fried " << this << io::endl; }
    #endif
 
private:
    StringBuffer buf;
};
 
// AutoStringStartup class
class AutoStringStartup {
public:
    template <class T>
    inline AutoString& operator<<(const T& value) {
        AutoString *str = new AutoString();
        return (*str) << value;
    }
};
 
// autostr object
extern AutoStringStartup autostr;
extern AutoStringStartup &_;
 
 
// Even faster autostring
#ifndef ELM_AUTOSTR_FAST_NO
 
template <class T>
inline AutoString& operator<<(CString str, const T& value)
    { return autostr << str << value; }
template <class T>
inline AutoString& operator<<(const String& str, const T& value)
    { return autostr << str << value; }
 
template <class T>
inline io::StringInput operator>>(const string& str, T& val)
    { io::StringInput in(str); in >> val; return in; }
 
template <class T>
inline io::StringInput operator>>(cstring str, T& val)
    { io::StringInput in(str); in >> val; return in; }
 
#endif // ELM_AUTOSTR_FAST_NO
 
} // elm
 
#endif // ELM_STRING_AUTOSTRING_H