CODEWITHSUNDEEP
c++boostboost-circularbuffer
Ibrar Ahmed
Ibrar Ahmed

Reputation: 1089

How to get element from circular_buffer

I am using boost library in MAC (xcode). I have two questions about boost::circular_buffer.

1 - I am getting syntax error when declaring the circular_buffer

boost::circular_buffer<int> cb(10);

Expected parameter decelerator
Expected ')'

2 - Second question is when I add element into boost::circular_buffer using push_back, how to extract / get the element from circular_buffer, pop_front does not give the element.

Upvotes: 2

Views: 7741

Answers (1)

Chad
Chad

Reputation: 19032

boost::circular_buffer<T>::front() gives you a reference to the element at the "front", while boost::circular_buffer<T>::pop_front() will remove that element.

boost::circular_buffer<T>::back() gives you a reference to the element at the back, while boost::circular_buffer<T>::pop_back() removes that element.

It appears your syntax error is resulting from the most vexing parse. Try instead:

boost::circular_buffer<int> cb;
cb.set_capacity(10);

Or more succinctly:

boost::circular_buffer<int> cb((10));

Upvotes: 4

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