Re: C++ Templates on MS VS C++
On May 13, 7:06 pm, coder_...@yahoo.com wrote:
I put together a quick array template for MS Visual Studio 2003, but I
ran into some trouble. It's been quite a while since I had to roll my
own templates, so I'd appreciate all help.
Example 1
Array<int> *ibuf = new Array<int>(100);
ibuf[0] = 100; //O K
Example 2
String *sptr = NULL;
Array<String*> *locales = new Array<String*>(50);
locales[0] = sptr; // ERROR, WHY?
(*locales)[0] = sptr; // OK, but WHY ???
Example 3 - OK: forward declaration of template class without
including template header.
template<class int8>
class Array;
Example 4 - ERROR: why ??? forward declaration of template class
without including template header.
template<class String*>
class Array;
Thank-you all!
=== ARRAY TEMPLATE ===
template<class T=int32>
class Array : public Object
{
public:
Array(int32 aSize);
virtual ~Array();
int32 length() const;
T& operator[](int32 i);
T *getData() const;
private:
T *data;
int32 size;
};
Consider something like this instead:
#include <iostream>
#include <string>
template< typename T, const size_t Size >
class Array
{
T m_a[Size];
public:
Array() { }
~Array() { }
size_t size() const { return Size; }
T& operator[](size_t i) { return m_a[i]; }
};
int main()
{
using std::string;
Array< string, 50 > locales;
locales[0] = "some locale";
std::cout << "locales[0] = " << locales[0];
std::cout << std::endl;
}
/*
locales[0] = some locale
*/
Better yet, if you need a dynamic Array, use a std::vector.
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