fixedstring.h

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#pragma once
/*
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        Kristofer
 Date:          April 2009
________________________________________________________________________

*/

#include "basicmod.h"
#include "odstring.h"



mExpClass(Basic) FixedString : public OD::String
{
public:

    inline              FixedString( const char* p = 0 )
                            : str_(p)           {}
    inline FixedString& operator=( const FixedString& fs )
                                                { str_ = fs.str_; return *this;}
    inline FixedString& operator=( const char* p )
                                                { str_ = p; return *this; }
    FixedString&        operator=(const OD::String&)    = delete;
    inline              operator const char*() const    { return buf(); }

    inline bool         operator==( const FixedString& fs ) const
                                                { return isEqual(fs.str_);}
    inline bool         operator!=( const FixedString& fs ) const
                                                { return !isEqual(fs.str_);}
    inline bool         operator==( const char* s ) const
                                                { return isEqual(s);}
    inline bool         operator!=( const char* s ) const
                                                { return !isEqual(s);}
    inline bool         operator==( const OD::String& s ) const
                                                { return isEqual(s.str()); }
    inline bool         operator!=( const OD::String& s ) const
                                                { return !isEqual(s.str()); }
    bool                operator==(const BufferString&) const;
    bool                operator!=(const BufferString&) const;

    inline              operator bool() const   { return !isNull(); }
    inline bool         operator !() const      { return isNull(); }
    inline bool         isNull() const          { return !str_; }
    inline char         firstChar() const       { return str_ ? *str_ : '\0'; }

    static const FixedString& empty();


protected:

    inline const char*  gtBuf() const   { return str_ ? str_ : ""; }
    inline const char*  gtStr() const   { return !str_ || !*str_ ? 0 : str_; }

    const char* str_;

};


namespace Values
{

template<>
mClass(Basic) Undef<FixedString>
{
public:

    static FixedString  val()                           { return FixedString();}
    static bool         hasUdf()                        { return true; }
    static bool         isUdf( const FixedString& s )   { return s.isEmpty(); }
    static void         setUdf( FixedString& s )        { s = FixedString(); }

};

}