103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/***********************************************************************
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* emptyfstring.h - Creates an empty FString object *
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* *
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* This file is part of the Final Cut widget toolkit *
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* *
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* Copyright 2015-2018 Markus Gans *
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* *
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* The Final Cut is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Lesser General Public License *
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* as published by the Free Software Foundation; either version 3 of *
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* the License, or (at your option) any later version. *
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* *
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* The Final Cut is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this program. If not, see *
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* <http://www.gnu.org/licenses/>. *
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***********************************************************************/
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#ifndef EMPTYFSTRING_H
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#define EMPTYFSTRING_H
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#if !defined (USE_FINAL_H) && !defined (COMPILE_FINAL_CUT)
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#error "Only <final/final.h> can be included directly."
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#endif
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#include "final/fstring.h"
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namespace finalcut
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{
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namespace fc
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{
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//----------------------------------------------------------------------
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// class emptyFString
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//----------------------------------------------------------------------
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#pragma pack(push)
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#pragma pack(1)
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class emptyFString
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{
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public:
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// Constructors
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emptyFString() = default;
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// Disable copy constructor
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emptyFString (const emptyFString&) = delete;
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// Disable assignment operator (=)
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emptyFString& operator = (const emptyFString&) = delete;
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static bool isNull();
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static const FString& get();
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static void clear();
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private:
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// Data Member
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static const FString* empty_string;
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};
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#pragma pack(pop)
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// emptyFString inline functions
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//----------------------------------------------------------------------
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inline bool emptyFString::isNull()
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{
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return ( empty_string ) ? false : true;
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}
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//----------------------------------------------------------------------
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inline const FString& emptyFString::get()
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{
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if ( ! empty_string )
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{
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try
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{
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empty_string = new FString("");
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}
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catch (const std::bad_alloc& ex)
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{
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std::cerr << bad_alloc_str << ex.what() << std::endl;
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}
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}
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return *empty_string;
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}
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//----------------------------------------------------------------------
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inline void emptyFString::clear()
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{
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delete empty_string;
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empty_string = nullptr;
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}
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} // namespace fc
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} // namespace finalcut
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#endif // EMPTYFSTRING_H
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