ostream.h

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#pragma once
 
#include <ostream>
#include <concepts>
#include <memory>
 
namespace ext {
 
class ostream {
    std::unique_ptr < std::ostream > m_os;
 
public:
    ostream ( std::basic_streambuf < char > * sb );
 
    virtual ~ostream ( ) noexcept;
 
protected:
    ostream ( ostream && rhs ) noexcept;
 
    ostream & operator = ( ostream && rhs ) noexcept;
 
public:
    template < class T >
    requires requires { std::declval < std::ostream > ( ) << std::declval < T > ( ); }
    friend ostream & operator << ( ostream & os, const T & val ) {
        static_cast < std::ostream & > ( os ) << val;
        return os;
    }
 
    friend ostream & operator << ( ostream & os, std::ostream & ( * fn ) ( std::ostream & ) );
 
/*  does no exist in std, note it should not
    friend ostream & operator << ( ostream & os, std::ios_base & ( * fn ) ( std::ios_base & ) ) {
        static_cast < std::ostream & > ( os ) >> fn;
        return os;
    }*/
 
protected:
    operator std::ostream & ( ) &;
 
    operator const std::ostream & ( ) const &;
 
public:
    ostream & put ( char ch );
 
    ostream & write ( const char * s, std::streamsize count );
 
    std::streampos tellp ( );
 
    ostream & seekp ( std::streampos pos );
 
    ostream & seekp ( std::streamoff off, std::ios_base::seekdir dir );
 
    ostream & flush ( );
 
    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 );
 
};
 
} /* namespace ext */