I wonder why cbegin
and cend
were introduced in C++11?
What are cases when calling these methods makes a difference from const overloads of begin
and end
?
It's quite simple. Say I have a vector:
std::vector<int> vec;
I fill it with some data. Then I want to get some iterators to it. Maybe pass them around. Maybe to std::for_each
:
std::for_each(vec.begin(), vec.end(), SomeFunctor());
In C++03, SomeFunctor
was free to be able to modify the parameter it gets. Sure, SomeFunctor
could take its parameter by value or by const&
, but there's no way to ensure that it does. Not without doing something silly like this:
const std::vector<int> &vec_ref = vec;
std::for_each(vec_ref.begin(), vec_ref.end(), SomeFunctor());
Now, we introduce cbegin/cend
:
std::for_each(vec.cbegin(), vec.cend(), SomeFunctor());
Now, we have syntactic assurances that SomeFunctor
cannot modify the elements of the vector (without a const-cast, of course). We explicitly get const_iterator
s, and therefore SomeFunctor::operator()
will be called with const int &
. If it takes it's parameters as int &
, C++ will issue a compiler error.
C++17 has a more elegant solution to this problem: std::as_const
. Well, at least it's elegant when using range-based for
:
for(auto &item : std::as_const(vec))
This simply returns a const&
to the object it is provided.