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(Nonsimple class: 8,000 bytes with both a copy constructor and a destructor)
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For our text query system, then, we'll use a vector to contain our string object with its default associated capacity Although the vector grows dynamically as we insert an unknown number of strings within it, as our timings show, it still performs slightly better than a list Before we get to our actual implementation, let's review how we can define a container object Exercise 62 Explain the difference between a vector's capacity and its size Why is it necessary to support the notion of capacity in a container that stores elements contiguously but not, for example, in a list Exercise 63 Why is it more efficient to store a collection of a large, complex class objects by pointer but less efficient to store a collection of integer objects by pointer Exercise 64
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In the following situations, which is the more appropriate container type, a list or a vector In each case, an unknown number of elements are inserted Explain your answer
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(a) Integer values (b) Pointers to a large, complex class object (c) Large, complex class objects
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Defining a Sequence Containery
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To define a container object, we must first include its associated header file, which is one of these:
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<vector> <list> <deque> <map> <set>
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The definition of a container object begins with the name of the container type followed by the actual type of the elements to be contained For example:
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[3] Implementations that do not currently support default template parameters require a second argument specifying the allocator Under these implementations, the above two definitions are declared as follows:
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vector< string, allocator > svec; list< int, allocator > ilist;
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[3] The allocator class encapsulates the abstraction of allocating and deleting dynamic memory It is predefined by the standard library and uses the new and delete operators The use of an allocation class serves two purposes: by shielding the containers from the details of this or that memory allocation strategy, it simplifies the implementation of the container Secondly, it is possible for the programmer to implement and/or specify alternative memory allocation strategies, such as the use of shared memory
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vector< string > svec; list< int > ilist;
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defines svec to be an empty vector of string objects and ilist to be an empty list of objects of type int Both svec and ilist are empty To confirm that, we can invoke the empty() operator For example:
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if ( svecempty() != true ) ; // oops, something wrong
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The simplest method of element insertion is push_back(), which inserts the element to the back of the container For example,
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string text_word; while ( cin >> text_word ) svecpush_back( text_word );
reads one string at a time into text_word from standard input push_back() then inserts a copy of the text_word string into svec The list (and deque) containers also support push_front(), which inserts the new element at the front of the list For example, suppose we have the following built-in array of type int:
int ia[ 4 ] = { 0, 1, 2, 3 };
The use of push_back()
for ( int ix = 0; ix < 4; ++ix ) ilistpush_back( ia[ ix ] );
creates the sequence 0,1,2,3, whereas the use of push_front()
for ( int ix = 0; ix < 4; ++ix ) ilistpush_front( ia[ ix ] );
creates the sequence 3,2,1,0 within ilist
If element insertion at the front becomes the predominant container activity, a deque performs significantly more efficiently than a vector and should be preferred
Alternatively, we may wish to specify an explicit size for the container The size can be either a constant or nonconstant expression:
#include <list> #include <vector> #include <string> extern int get_word_count( string file_name ); const int list_size = 64; list< int > ilist( list_size ); vector< string > svec(get_word_count(string("Chimera")));
Each element within the container is initialized with the associated default value for its type For an integer, a default value of 0 is used to initialize each element For the string class, each element is initialized with the associated string default constructor Rather than initialize each element to its associated default value, we can specify a value with which to initialize each element For example:
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