October 1999
Beginner
304 pages
7h 11m
English
Content preview from Essential C++
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2.4. Using Local Static Objects
Our fibon_seq() function of Section 2.2 calculates a Fibonacci sequence of a user-specified size with each invocation, returning a vector holding the elements. That is a bit more work than is necessary.
We really need only one Fibonacci sequence vector. The elements, after all, are invariant. The only thing that changes from one call of fibon_seq() to the next is the number of elements the user wishes to have available. Consider the following three invocations of fibon_seq():
fibon_seq( 24 ); fibon_seq( 8 ); fibon_seq( 18 );
The first call calculates all the values necessary to fulfill the request of the second and third invocations. If a fourth invocation requested 32 elements, we really need calculate only ...
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