S
Sepidar
hi all,
I'm trying to write a custom allocator for myself, using with
std::jvector. But it seems that I have no response from it. See the
code:
#include <iostream>
#include <vector>
#include <memory>
using std::cout;
using std::endl;
class MyClass
{
public:
MyClass(){cout<<"a new instance of MyClass created!"<<endl;}
~MyClass(){cout<<"one instance of MyClass destroyd!"<<endl;}
};
typedef MyClass* MyClassPointer;
class MyAllocator
ublic std::allocator<MyClassPointer>
{
public:
MyAllocator()
{
cout<<"message from MyAllocator::MyAllocator"<<endl;
}
void destroy(pointer p)
{
cout<<"message from MyAllocator::destroy"<<endl;
//whatever
//std::allocator<MyClassPointer>::destroy(p);
}
void deallocate(pointer p, size_type n)
{
cout<<"message from MyAllocator::deallocate"<<endl;
//whatever
//std::allocator<MyClassPointer>::deallocate(p,n);
}
};
typedef std::vector<MyClassPointer,MyAllocator> MyVector;
int main()
{
MyVector vec;
vec.push_back(new MyClass());
vec.pop_back(); //free memory and print someting on screen
vec.clear(); //please do it!
return 0;
}
It is expected that the code return at least message from
MyAllocator's constructor, but there is nothing showing that. Please
help.
I'm trying to write a custom allocator for myself, using with
std::jvector. But it seems that I have no response from it. See the
code:
#include <iostream>
#include <vector>
#include <memory>
using std::cout;
using std::endl;
class MyClass
{
public:
MyClass(){cout<<"a new instance of MyClass created!"<<endl;}
~MyClass(){cout<<"one instance of MyClass destroyd!"<<endl;}
};
typedef MyClass* MyClassPointer;
class MyAllocator
ublic std::allocator<MyClassPointer>{
public:
MyAllocator()
{
cout<<"message from MyAllocator::MyAllocator"<<endl;
}
void destroy(pointer p)
{
cout<<"message from MyAllocator::destroy"<<endl;
//whatever
//std::allocator<MyClassPointer>::destroy(p);
}
void deallocate(pointer p, size_type n)
{
cout<<"message from MyAllocator::deallocate"<<endl;
//whatever
//std::allocator<MyClassPointer>::deallocate(p,n);
}
};
typedef std::vector<MyClassPointer,MyAllocator> MyVector;
int main()
{
MyVector vec;
vec.push_back(new MyClass());
vec.pop_back(); //free memory and print someting on screen
vec.clear(); //please do it!
return 0;
}
It is expected that the code return at least message from
MyAllocator's constructor, but there is nothing showing that. Please
help.