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01 Type erasure на примере RPG-игры. · gusenov/examples-cpp@6228603 · GitHub
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Type erasure на примере RPG-игры.
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‎README.md

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- [Сэндвич](syncfusion/cpp_succinctly/PimplSample)
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## [Type Erasure](type-erasure)
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- [RPG game](type-erasure/rpg-game)
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# Стандартная библиотека
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‎type-erasure/rpg-game/.gitignore

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# ---------------------------------------------------------------------------
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# https://github.com/github/gitignore/blob/master/C++.gitignore
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# ---------------------------------------------------------------------------

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‎type-erasure/rpg-game/CMakeLists.txt

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cmake_minimum_required(VERSION 3.23)
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project(RPG_game)
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set(CMAKE_CXX_STANDARD 17)
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add_executable(${PROJECT_NAME} main.cc Object.cc)

‎type-erasure/rpg-game/Object.cc

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#include "Object.h"
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#include "items/Weapon.h"
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#include "items/Armor.h"
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#include "items/Potion.h"
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#include "items/Scroll.h"
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#include "items/FireScroll.h"
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#include "items/PoisonPotion.h"
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#include "ObjectConcept.h"
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/**
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* just done the inheritance thing. How is this better?
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* It is better not because it affords you more functionality than the inheritance approach,
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* but because it does not tighly couple Weapons and Armors etc through a common base class.
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* It gives me the power of retaining type as templates do.
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*/
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template<typename T>
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struct ObjectModel
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: ObjectConcept
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{
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ObjectModel(T const& t)
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: object(t)
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{}
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~ObjectModel() override = default;
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bool has_attack_concept() const override
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{
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return object.can_attack();
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}
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std::string name() const override
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{
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return typeid(object).name();
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}
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private:
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T object;
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};
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#pragma mark - Object
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template<typename T>
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Object::Object(T const& obj )
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: object_(new ObjectModel<T>(obj))
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{}
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template Object::Object(Weapon const&);
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template Object::Object(Armor const&);
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template Object::Object(Potion const&);
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template Object::Object(Scroll const&);
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template Object::Object(FireScroll const&);
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template Object::Object(PoisonPotion const&);
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std::string Object::name() const
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{
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return object_->name();
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}
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bool Object::has_attack_concept() const
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{
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return object_->has_attack_concept();
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}

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