149 lines
4.1 KiB
C++
149 lines
4.1 KiB
C++
/*! @file pivariantsimple.h
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* @brief Variant simple type
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*
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* This file declares PIVariantSimple
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*/
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/*
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PIP - Platform Independent Primitives
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Variant simple type
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Ivan Pelipenko peri4ko@yandex.ru
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PIVARIANTSIMPLE_H
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#define PIVARIANTSIMPLE_H
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#include "pistring.h"
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#include <typeinfo>
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#ifdef MICRO_PIP
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#include "pivariant.h"
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#endif
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class __VariantFunctionsBase__ {
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public:
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virtual __VariantFunctionsBase__ * instance() {return 0;}
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virtual PIString typeName() const {return PIString();}
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virtual uint hash() const {return 0;}
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virtual void newT(void *& ptr, const void * value) {;}
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virtual void newNullT(void *& ptr) {;}
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virtual void assignT(void *& ptr, const void * value) {;}
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virtual void deleteT(void *& ptr) {;}
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};
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template<typename T>
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class __VariantFunctions__: public __VariantFunctionsBase__ {
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public:
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__VariantFunctionsBase__ * instance() final {static __VariantFunctions__<T> ret; return &ret;}
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#ifdef MICRO_PIP
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PIString typeName() const final {static PIString ret(PIVariant(T()).typeName()); return ret;}
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#else
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PIString typeName() const final {static PIString ret(typeid(T).name()); return ret;}
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#endif
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uint hash() const final {static uint ret = typeName().hash(); return ret;}
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void newT(void *& ptr, const void * value) final {ptr = (void*)(new T(*(const T*)value));}
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void newNullT(void *& ptr) final {ptr = (void*)(new T());}
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void assignT(void *& ptr, const void * value) final {*(T*)ptr = *(const T*)value;}
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void deleteT(void *& ptr) final {delete (T*)(ptr);}
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};
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class PIVariantSimple {
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public:
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PIVariantSimple() {ptr = 0; f = 0;}
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PIVariantSimple(const PIVariantSimple & v) {
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ptr = 0;
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f = v.f;
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if (f && v.ptr)
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f->newT(ptr, v.ptr);
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}
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~PIVariantSimple() {destroy();}
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PIVariantSimple & operator=(const PIVariantSimple & v) {
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destroy();
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f = v.f;
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if (f && v.ptr)
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f->newT(ptr, v.ptr);
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return *this;
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}
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template <typename T>
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void setValue(const T & v) {
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if (f) {
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if (isMyType<T>()) {
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f->assignT(ptr, (const void *)&v);
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return;
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}
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}
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destroy();
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f = __VariantFunctions__<T>().instance();
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f->newT(ptr, (const void *)&v);
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}
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template <typename T>
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T value() const {
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if (!f) return T();
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if (!isMyType<T>())
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return T();
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return *(T*)(ptr);
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}
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template <typename T>
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static PIVariantSimple fromValue(const T & v) {
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PIVariantSimple ret;
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ret.setValue(v);
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return ret;
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}
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private:
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template <typename T>
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bool isMyType() const {
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if (!f) return false;
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uint mh = f->hash(), th = __VariantFunctions__<T>().instance()->hash();
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if (mh == 0 || th == 0) return false;
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return mh == th;
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}
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void destroy() {
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if (ptr && f)
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f->deleteT(ptr);
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ptr = 0;
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f = 0;
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}
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void * ptr;
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__VariantFunctionsBase__ * f;
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};
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#define REGISTER_PIVARIANTSIMPLE(Type) \
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template<> \
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class __VariantFunctions__<Type>: public __VariantFunctionsBase__ { \
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public: \
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__VariantFunctionsBase__ * instance() final {static __VariantFunctions__<Type> ret; return &ret;} \
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PIString typeName() const final {static PIString ret(#Type); return ret;} \
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uint hash() const final {static uint ret = typeName().hash(); return ret;} \
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void newT(void *& ptr, const void * value) final {ptr = (void*)(new Type(*(const Type *)value));} \
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void newNullT(void *& ptr) final {ptr = (void*)(new Type());} \
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void assignT(void *& ptr, const void * value) final {*(Type *)ptr = *(const Type *)value;} \
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void deleteT(void *& ptr) final {delete (Type *)(ptr);} \
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};
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REGISTER_PIVARIANTSIMPLE(std::function<void(void*)>)
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#endif // PIVARIANTSIMPLE_H
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