istream.h

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/*
 * This file is part of Algorithms library toolkit.
 * Copyright (C) 2017 Jan Travnicek (jan.travnicek@fit.cvut.cz)
 
 * Algorithms library toolkit 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 3 of the License, or
 * (at your option) any later version.
 
 * Algorithms library toolkit 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 Algorithms library toolkit.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <istream>
#include <concepts>
#include <memory>
 
namespace ext {
 
class istream {
    std::unique_ptr < std::istream > m_os;
 
public:
    istream ( std::basic_streambuf < char > * sb );
 
    virtual ~istream ( ) noexcept;
 
protected:
    istream ( istream && rhs ) noexcept;
 
    istream & operator = ( istream && rhs ) noexcept;
 
public:
    template < class T >
    requires requires { std::declval < std::istream > ( ) << std::declval < T > ( ); }
    friend istream & operator >> ( istream & os, const T & val ) {
        static_cast < std::istream & > ( os ) >> val;
        return os;
    }
 
    friend istream & operator >> ( istream & os, std::istream & ( * fn ) ( std::istream & ) );
 
    friend istream & operator >> ( istream & os, std::ios_base & ( * fn ) ( std::ios_base & ) );
 
protected:
    operator std::istream & ( ) &;
 
    operator const std::istream & ( ) const &;
 
public:
    int peek ( );
 
    int get ( );
 
    istream & get ( char & ch );
 
    istream & unget ( );
 
    istream & putback ( char ch );
 
    istream & read ( char * s, std::streamsize count );
 
    std::streampos tellg ( );
 
    istream & seekg ( std::streampos pos );
 
    istream & seekg ( std::streamoff off, std::ios_base::seekdir dir );
 
    istream & sync ( );
 
    std::streambuf * rdbuf ( ) const;
 
    std::streambuf * rdbuf ( std::streambuf * buf );
 
    void setstate ( std::ios_base::iostate state );
 
    void clear ( std::ios_base::iostate state = std::ios_base::goodbit );
 
    bool good ( ) const;
 
    bool fail ( ) const;
 
    bool eof ( ) const;
 
    operator bool ( ) const;
};
 
ext::istream & operator >> ( ext::istream & in, const std::string & str );
 
} /* namespace ext */