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The deque container supports random-access iterators, and the [ ] is overloaded This means that a deque object can be indexed like an array It also means that a deque can be traversed in both the forward and reverse directions by use of an iterator The deque container provides all required sequence container functions, including those for a reversible container, and all optional sequence container functions This makes deque the most general-purpose container Although deque and vector have different performance characteristics, they offer nearly identical functionality For example, the standard sequence functions implemented by deque, such as insert( ), erase( ), begin( ), end( ), rbegin( ), rend( ), operator[ ]( ), front( ), back( ), push_back( ), and so on, work in deque just like they work in vector The resize( ) function provided by deque also works like the one provided by vector Because a detailed discussion of these standard methods is presented in Use vector, those discussions are not duplicated here (Note, however, that deque does not support the capacity( ) and reserve( ) methods defined for vector They are not needed by deque) The deque class does support two functions not provided by vector: push_front( ) and pop_front( ) They are shown here: void push_front(const T &val) void pop_front( ) The push_front( ) function adds an element with the value specified by val to the start of the container The container is automatically increased in size to accommodate the addition The pop_front( ) function removes an element from the start of the container The deque class has the following performance characteristics Pushing or popping elements from either end of a deque takes place in constant time When occurring in the middle, insertions or erasures of elements take place in linear time Access of an element via the subscripting operator takes place in constant time Since adding or deleting elements from the ends of a deque are quite efficient, deques make an excellent choice when these types of operations will occur frequently The ability to make efficient additions to the start of the deque is one of the principal differences between vector and deque An insertion into the middle of a deque container invalidates all iterators and references to the contents of that container Because deque is typically implemented as a double-ended dynamic array, an insertion implies that existing elements will be "spread apart" to accommodate the new elements Thus, if an iterator is pointing to an element prior to an insertion, there is no guarantee that it will be pointing to the same element after the insertion The same applies to references An insertion at the head or the tail of a deque invalidates iterators, but not references An erasure to the middle invalidates both iterators and references An erasure limited to either end invalidates only those iterators and references that point to the elements that are being erased
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The following example shows deque in action For comparison purposes, it reworks the example used for vector, substituting deque for vector throughout Because vector and deque are very similar in the features that each provides, most of the two programs are the same Of course, the calls to capacity( ) and reserve( ) that are in the vector version have been removed because these functions are not supported by deque Also, the functions push_front( ) and
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pop_front( ) have been added As explained, these functions are provided by deque but not vector
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// Demonstrate deque #include <iostream> #include <deque> using namespace std; void show(const char *msg, deque<int> q); int main() { // Declare a deque that has an initial capacity of 10 deque<int> dq(10); // Assign its elements some values Notice how this is // done using the standard array-subscripting syntax // Notice that the number of elements in the deque is // obtained by calling size() for(unsigned i=0; i < dqsize(); ++i) dq[i] = i*i; show("Contents of dq: ", dq); // Compute the average of the values Again, notice // the use of the subscripting operator int sum = 0; for(unsigned i=0; i < dqsize(); ++i) sum += dq[i]; double avg = sum / dqsize(); cout << "The average of the elements is " << avg << "\n\n"; // Add elements to the end of dq dqpush_back(100); dqpush_back(121); show("dq after pushing elements onto the end: ", dq); cout << endl; // Now use pop_back() to remove one element dqpop_back(); show("dq after back-popping one element: ", dq); cout << endl; cout << "The first and last element in dq as" << " pointed to by begin() and end()-1:\n" << *dqbegin() << ", " << *(dqend()-1) << "\n\n"; cout << "The first and last element in dq as" << " pointed to by rbegin() and rend()-1:\n" << *dqrbegin() << ", " << *(dqrend()-1) << "\n\n"; // Declare an iterator to a deque<int>
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