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Diffstat (limited to 'lotuswordpro/source/filter/clone.hxx')
-rw-r--r-- | lotuswordpro/source/filter/clone.hxx | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lotuswordpro/source/filter/clone.hxx b/lotuswordpro/source/filter/clone.hxx new file mode 100644 index 000000000..fe4c64519 --- /dev/null +++ b/lotuswordpro/source/filter/clone.hxx @@ -0,0 +1,71 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#ifndef INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_CLONE_HXX +#define INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_CLONE_HXX + +namespace detail +{ + +template<typename T> +struct has_clone +{ + template<typename U, U x> + struct test; + + typedef char yes; + typedef struct { char a[2]; } no; + + template<typename U> + static yes& check_sig(U*, test<U* (U::*)() const, &U::clone>* = nullptr); + template<typename U> + static no& check_sig(...); + + enum + { + value = sizeof(check_sig<T>(nullptr)) == sizeof(yes) + }; +}; + +template<typename T, bool HasClone> +struct cloner +{ + static T* clone(T* const other) + { + return new T(*other); + } +}; + +template<typename T> +struct cloner<T, true> +{ + static T* clone(T* const other) + { + return other->clone(); + } +}; + +} + +/** Creates a new copy of the passed object. + If other is 0, just returns 0. Otherwise, if other has function + named clone with signature T* (T::*)() const, the function is called. + Otherwise, copy constructor is used. + + @returns 0 or newly allocated object + */ +template<typename T> +T* clone(T* const other) +{ + return other ? ::detail::cloner<T, ::detail::has_clone<T>::value>::clone(other) : nullptr; +} + +#endif // INCLUDED_LOTUSWORDPRO_SOURCE_FILTER_CLONE_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |