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add pointer

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add "dynamic" heap array
add polymorphic
This commit is contained in:
david
2025-03-26 12:44:05 +01:00
parent abb1ea4a38
commit 4b6ac6a484
13 changed files with 339 additions and 1 deletions
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CPlusPlus/CPlusPlus.sln
+14
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@@ -11,6 +11,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Classes", "Classes\Classes.
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Collections", "Collections\Collections.vcxproj", "{1B177393-37B1-4C7B-BCF0-163991832930}"
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Pointer", "Pointer\Pointer.vcxproj", "{860DAD08-212F-4265-B3F8-8BBF85AA4833}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|ARM64 = Debug|ARM64
@@ -69,6 +71,18 @@ Global
{1B177393-37B1-4C7B-BCF0-163991832930}.Release|x64.Build.0 = Release|x64
{1B177393-37B1-4C7B-BCF0-163991832930}.Release|x86.ActiveCfg = Release|Win32
{1B177393-37B1-4C7B-BCF0-163991832930}.Release|x86.Build.0 = Release|Win32
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Debug|ARM64.ActiveCfg = Debug|ARM64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Debug|ARM64.Build.0 = Debug|ARM64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Debug|x64.ActiveCfg = Debug|x64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Debug|x64.Build.0 = Debug|x64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Debug|x86.ActiveCfg = Debug|Win32
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Debug|x86.Build.0 = Debug|Win32
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Release|ARM64.ActiveCfg = Release|ARM64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Release|ARM64.Build.0 = Release|ARM64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Release|x64.ActiveCfg = Release|x64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Release|x64.Build.0 = Release|x64
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Release|x86.ActiveCfg = Release|Win32
{860DAD08-212F-4265-B3F8-8BBF85AA4833}.Release|x86.Build.0 = Release|Win32
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
CPlusPlus/Classes/Entity.cpp
+4
View File
@@ -11,6 +11,10 @@ Entity::Entity(std::string name) : name(name)
//this->name = name;
}
Entity::~Entity()
{
}
std::string Entity::ToString()
{
return name;
CPlusPlus/Classes/Entity.h
+1
View File
@@ -6,6 +6,7 @@ class Entity
public:
Entity();
Entity(std::string name);
virtual ~Entity();
virtual std::string ToString();
CPlusPlus/Classes/ICompareable.h
+2
View File
@@ -3,5 +3,7 @@
class ICompareable
{
public:
virtual ~ICompareable() {}
virtual int Compare(ICompareable* other) = 0;
};
CPlusPlus/Classes/Monster.cpp
+4
View File
@@ -7,6 +7,10 @@ Monster::Monster(int strength) : Entity("My Monster"), _strength(strength)
this->name = "My Monster";
}
Monster::~Monster()
{
}
//Monster Monster::Create(Monsters type)
//{
// Monster monster;
CPlusPlus/Classes/Monster.h
+1
View File
@@ -13,6 +13,7 @@ class Monster : public Entity, public ICompareable
{
public:
Monster(int strength);
virtual ~Monster();
//static Monster Create(Monsters type);
CPlusPlus/Classes/Ork.cpp
+10
View File
@@ -6,6 +6,16 @@ Ork::Ork() : Monster(10)
this->name = "My Ork";
}
Ork::Ork(const Ork& other) : Monster(other._strength)
{
this->name = other.name;
this->_speed = other._speed;
}
Ork::~Ork()
{
}
void Ork::Move()
{
}
CPlusPlus/Classes/Ork.h
+3 -1
View File
@@ -4,7 +4,9 @@
class Ork : public Monster
{
public:
Ork();
Ork(); // default constructor
Ork(const Ork&); // copy constructor
~Ork(); // destructor
void Move() override;
};
CPlusPlus/Classes/main.cpp
+17
View File
@@ -24,5 +24,22 @@ int main()
Vector3 position(1.0f, 3.0f, -5.0f);
position.y = 0.0f;
ICompareable* pComparable = nullptr;
pComparable = &ork;
pComparable->Compare(&ork);
(*pComparable).Compare(&ork); // same as line above, but more complicated to write
ICompareable* pComparables[] = { new Ork, new Ork, new Ork };
for (size_t i = 0; i < size(pComparables); i++)
{
//pComparables[i]->Compare(nullptr);
delete pComparables[i];
pComparables[i] = nullptr;
}
ICompareable** pHeapComparables = new ICompareable*[10];
delete[] pHeapComparables;
pHeapComparables = nullptr;
return 0;
}
CPlusPlus/Collections/main.cpp
+13
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@@ -51,6 +51,19 @@ int main()
printArray(numbers2);
printArray(numbers2, std::size(numbers2));
// "dynamic" (heap) arrays
int count2 = 10;
int* heapNumbers = new int[count2];
heapNumbers[0] = 10;
int* pHeapNumber = heapNumbers;
for (size_t i = 0; i < count2; i++)
{
cout << pHeapNumber << ": " << *pHeapNumber << " ";
pHeapNumber++;
}
delete[] heapNumbers; // CAUTION - heap arrays have to be deleted with delete[] not delete
heapNumbers = nullptr;
// stl collections
vector<int> numbers6;
vector<int> numbers7 = { 0, 1, 2, 3 };
CPlusPlus/Pointer/Pointer.vcxproj
+190
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@@ -0,0 +1,190 @@
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<Platform>ARM64</Platform>
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<ProjectConfiguration Include="Release|ARM64">
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<Platform>ARM64</Platform>
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<VCProjectVersion>17.0</VCProjectVersion>
<Keyword>Win32Proj</Keyword>
<ProjectGuid>{860dad08-212f-4265-b3f8-8bbf85aa4833}</ProjectGuid>
<RootNamespace>Pointer</RootNamespace>
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CPlusPlus/Pointer/Pointer.vcxproj.filters
+22
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@@ -0,0 +1,22 @@
<?xml version="1.0" encoding="utf-8"?>
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<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
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CPlusPlus/Pointer/main.cpp
+58
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@@ -0,0 +1,58 @@
#include <iostream>
using namespace std;
void changeInteger(int n);
void changeIntegerPerPointer(int* pN);
int changeIntegerPerReturn(int n);
void changeIntegerPerReference(int& n);
int main()
{
// general
int* pNumber = nullptr;
pNumber = new int(0);
cout << "size of pNumber: " << sizeof(pNumber) << endl;
cout << "size of pNumber data: " << sizeof(*pNumber) << endl;
*pNumber = 567;
//pNumber = new int(0); // BAD BAD - Memory Leak, because we override an existing pointer address with a new one without saving the old one
// here are 100s of lines of code
if (pNumber != nullptr)
{
delete pNumber;
pNumber = nullptr;
}
// pointer as references
int number = 0;
changeInteger(number);
changeIntegerPerPointer(&number);
changeIntegerPerPointer(pNumber);
changeIntegerPerReference(number);
return 0;
}
void changeInteger(int n)
{
n = 100;
}
void changeIntegerPerPointer(int* pN)
{
cout << "address of pN: " << &pN << endl;
if (pN == nullptr) return; // BE CAREFUL - if you don't what you get, do a test before
*pN = 200;
}
void changeIntegerPerReference(int& n)
{
n = 300;
}