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I am working on a C++ program, and I need to initialize a vector of pointers. I know how to initialize a vector, but if someone could show me how to initialize it as a vector filled with pointers that would be great!
815
Another way to initialize a vector in C++ is to pass an array of elements to the vector class constructor. The array elements will be inserted into the vector in the same order, and the size of the vector will be adjusted automatically. You pass the array of elements to the vector at the time of initialization.
You can store pointers in a vector just like you would anything else. Declare a vector of pointers like this: vector<MyClass*> vec; The important thing to remember is that a vector stores values without regard for what those values represent.
Yes. vector::erase destroys the removed object, which involves calling its destructor.
A zero-size vector of pointers:
std::vector<int*> empty;
A vector of NULL pointers:
std::vector<int*> nulled(10);
A vector of pointers to newly allocated objects (not really initialization though):
std::vector<int*> stuff;
stuff.reserve(10);
for( int i = 0; i < 10; ++i )
stuff.push_back(new int(i));
Initializing a vector of pointers to newly allocated objects (needs C++11):
std::vector<int*> widgets{ new int(0), new int(1), new int(17) };
A smarter version of #3:
std::vector<std::unique_ptr<int>> stuff;
stuff.reserve(10);
for( int i = 0; i < 10; ++i )
stuff.emplace_back(new int(i));
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