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In addition to the version of insert( ) used in this recipe, all sequence containers support the two forms shown here: void insert(iterator i, size_type num, const T &val) template <class InIter> void insert(iterator i, InIter start, InIter end)
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The first form inserts num copies of val immediately before the element specified by i The second form inserts the sequence that runs from start to end 1 immediately before the element specified by i Notice that start and end do not need to point into the invoking container Thus, this form can be used to insert elements from one container into another Furthermore, the containers do not need to be of the same kind As long as the elements are compatible, you can insert elements from a deque into a list, for example There is a second form of erase( ) that is supported by all sequence containers It is shown here: iterator erase(iterator start, iterator end) This version removes elements in the range start to end 1 and returns an iterator to the element after the last element removed In addition to the ==, <, and > operators, all sequence containers support the <=, >=, and != logical operators You can find the maximum number of elements that a container can hold by calling max_size( ), shown here: size_type max_size( ) const Understand that the maximum size will vary, depending on the type of data the container holds Also, different types of containers may (probably will) have differing maximum capacities As mentioned, the preceding example works for all sequence containers To prove this, try substituting list or deque for vector As you will see, the program produces the same output as before Of course, choosing the right container is an important part of using the STL successfully Remember, different containers have different performance guarantees For example, inserting an element into the middle of a deque takes linear time Inserting into a list takes constant time Inserting into the middle of a vector uses linear time, but inserting on the end can occur in constant time (if no reallocation is required) In general, if there is no compelling reason to choose one container over another, the vector is usually the best choice because it implements what is, in essence, a dynamic array (see Use vector) In some cases, you will want to use one of the sequence container adaptors, such as queue, stack, or priority_queue, that provides a specific functionality that you desire For example, if you want a container that implements a classic stack, then use stack For a single-ended queue, use queue For a queue that is ordered according to priority, use priority_queue
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Headers <vector> Classes vector Functions template <class InIter> void assign(InIter start, InIter end) reference at(size_type i) reference back( ) size_type capacity( ) const reference front( ) reference operator[ ](size_type i) void pop_back( ) void push_back(const T &val) void reserve(size_type num) void resize(size_type num, T val = T( ))
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This recipe demonstrates vector, which is probably the most widely used sequence container because it implements a dynamic array Unlike a static array, whose dimensions are fixed at compile time, a dynamic array can grow as needed during program execution This makes vector an excellent choice for situations in which you need an array but don't know in advance how large it needs to be Even though the array created by vector is dynamic, its elements can still be accessed using the normal array-subscripting operator [ ] This makes it easy to drop vector into situations that would otherwise require an array
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NOTE The focus of this recipe is on the attributes and features of vector that make it unique See
Basic Sequence Container Techniques for information that applies to all sequence containers
Step-by-Step
Using vector involves the following steps: 1 Create a vector instance of the desired type and initial size 2 Assign or obtain values to elements via the subscripting operator 3 Use the at( ) function as an alternative to the subscripting operator 4 Add elements to the vector using either insert( ) or push_back( ) 5 Remove elements from the end by calling pop_back( ) 6 Obtain a reference to the first element in the vector by calling front( )
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