Another example
suggest changeLet’s say we have vector:
std::vector<int> intVector;
And we want to declare an iterator for this vector. An obvious idea is to use auto
. However, it may be needed just declare an iterator variable (and not to assign it to anything). We would do:
vector<int>::iterator iter;
However, with decltype
it becomes easy and less error prone (if type of intVector
changes).
decltype(intVector)::iterator iter;
Alternatively:
decltype(intVector.begin()) iter;
In second example, the return type of begin
is used to determine the actual type, which is vector<int>::iterator
.
If we need a const_iterator, we just need to use cbegin
:
decltype(intVector.cbegin()) iter; // vector<int>::const_iterator
Found a mistake? Have a question or improvement idea?
Let me know.
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