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add forward declaration examples

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add classes
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david
2025-09-15 12:39:48 +02:00
parent 478a876e37
commit 33af26ed44
19 changed files with 643 additions and 1 deletions
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CPlusPlus/Classes/Classes.vcxproj
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<ClCompile Include="Monster.cpp" />
<ClCompile Include="Ork.cpp" />
<ClCompile Include="Weapon.cpp" />
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CPlusPlus/Classes/Classes.vcxproj.filters
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CPlusPlus/Classes/Entity.cpp
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#include "Entity.h"
using namespace MyNamespace;
Entity::Entity() // constructor definition
{ }
Entity::Entity(std::string n) : _name(n)
{
//_name = n;
}
CPlusPlus/Classes/Entity.h
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#pragma once
#include <string>
namespace MyNamespace
{
class Entity
{
public:
Entity(); // constructor declaration
Entity(std::string n);
virtual std::string ToString() { return "Entity"; } // defined
void setName(std::string n) { _name = n; } // defined
std::string getName() { return _name; }
protected:
std::string _name = "";
}; // IMPORTANT: semicolon at the end
}
CPlusPlus/Classes/Monster.cpp
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#include "Monster.h"
Monster::Monster()
{
//ToString();
}
CPlusPlus/Classes/Monster.h
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#pragma once
#include "Entity.h"
class Monster : public MyNamespace::Entity
{
public:
Monster();
std::string ToString() override { return "Monster"; }
};
CPlusPlus/Classes/Ork.cpp
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#include "Ork.h"
Ork::Ork()
{
//ToString();
}
CPlusPlus/Classes/Ork.h
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#pragma once
#include "Monster.h"
class Ork : public Monster
{
public:
Ork();
std::string ToString() override { return "Ork"; }
};
CPlusPlus/Classes/Vector3.h
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#pragma once
struct Vector3
{
float x;
float y;
float z;
Vector3() : x(0.0f), y(0.0f), z(0.0f) {}
Vector3(float _x, float _y, float _z) : x(_x), y(_y), z(_z) {}
};
CPlusPlus/Classes/Weapon.cpp
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#include "Weapon.h"
CPlusPlus/Classes/Weapon.h
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#pragma once
class Weapon
{
};
CPlusPlus/Classes/main.cpp
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#include <iostream>
#include "Entity.h"
#include "Monster.h"
#include "Vector3.h"
using namespace MyNamespace;
using namespace std;
int main()
{
Entity entity; // this is an instance
cout << entity.ToString() << endl;
Monster monster;
cout << monster.ToString() << endl;
Vector3 position(1.0f, 0.0f, 2.0f);
Vector3 position2 = Vector3();
Vector3 position3{}; // list-initializer
return 0;
}