Let's say I have the following const vector of pointer :
const std::vector<Component*> components;
and I want to iterate through it and only calling a method on one element of this vector. Is it correct to do :
for (const auto& item : components) {
method(item);
}
What is the difference with using :
for (auto item : components) {
method(item);
}
with :
void method(Components* component);
It depends on you.
For the 1st case, the type of
item
will beComponent* const&
, which is a reference bound to the element of thevector
.For the 2nd case, the type of
item
will beComponent*
, which (i.e. the pointer itself) is copied from the the element of thevector
.The parameter type of
method
isComponent*
, means passing the pointer by value/copy, then there's no actual difference between the 2 cases. And for pointer (as built-in type), justauto item : components
is fine here.