Re: template question: preallocation for the underlying deque in user-defined queue
On Oct 3, 12:58 pm, Heck <hec...@inordertostymieharvestersverizon.net>
wrote:
template <class T> class QUEUE2 {
protected:
std::deque<T> c; // the actual container
public:
/* *********
This sad business makes the code fail to compile. I've tried a
number of variations which result in redefinitions of c (the actual
container) or c not found.
// constructor - allow a pre-allocation for the deque's elements
QUEUE2( int prealloc) {
std::deque<T> c( prealloc ); // the actual container
}
The c in the ctor is a local object that also hides the field c
in class QUEUE2, which is not what you want.
You can try the following:
template <class T> class QUEUE2 {
...
std::deque<T> *c;
....
QUEUE2( int prealloc) {
c = new std::deque<T> (prealloc);
}
Or
template <class T, int n> class QUEUE2 {
...
std::deque<T> c(n);
...
}
where I think 'n' must be compile-time constant when
instantiating QUEUE2.
JG
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