Mark wrote:
Quote:
Sorry for creating such a newbish topic, but I just can't seem to
figure out what the problem is here.
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// main.cpp
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#include <cstdlib>
#include <iostream>
#include "Vector.h"
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#include <stdexcept>
loose the using directive
Quote:
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int main(int argc, char *argv[])
{
Vector<intv1;
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system("PAUSE");
return EXIT_SUCCESS;
}
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int main()
{
try
{
Vector< int vn;
// throw std::runtime_error("testing runtime_error");
}
catch( const IndexOutofBounds& r_e )
{
std::cout << "error: index out of bounds caught!\n";
}
catch ( const std::exception& r_e )
{
std::cout << "error: ";
std::cout << r_e.what() << std::endl;
}
return 0;
}
Quote:
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// Vector.h
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#ifndef VECTOR_H
#define VECTOR_H
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#include <stdexcept>
Quote:
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class IndexOutofBounds {
};
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template <class T>
class Vector {
public:
Vector();
Vector(int size);
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Vector(size_t size); // suggestion
Quote:
Vector(const Vector& r);// COPY
virtual ~Vector();
T& operator[](int index) throw(IndexOutofBounds);
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T& operator[](size_t index)
throw(IndexOutofBounds, std::bad_exception);
See below about the bad_exception...
assignment operator?
size_t size() const;
Quote:
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int inflate(int addSize);
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size_t infalte(const size_t addSize);
Quote:
private:
T *m_pElements;
int m_nSize;
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size_t m_nSize;
Note: size_t is just a suggestion. The const are not.
Quote:
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#endif
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// Vector.cpp
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#include "Vector.h"
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// consturctors
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Keep your templates inline or read the faq:
http://www.parashift.com/c++-faq-lite/templates.html
[35.15] How can I avoid linker errors with my template classes?
Quote:
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template <class T>
Vector<T>::Vector() : m_nSize(0), m_pElements(0) {}
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nice
Quote:
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template <class T>
Vector<T>::Vector(int size) : m_nSize(size) {
m_pElements = new T[m_nSize];
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consider smart pointers, like boost::shared_ptr.
Highly recommended and easy to use.
Quote:
}
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template <class T>
Vector<T>::Vector(const Vector& r) {
m_nSize = r.m_nSize;
m_pElements = new T[m_nSize];
for(int i=0; i<m_nSize; i++)
m_pElements[i] = r.m_pElements[i];
}
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// destructor
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template <class T>
Vector<T>::~Vector() {
delete[] m_pElements;
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// ... plus rest of functions
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compile log:
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g++.exe -c main.cpp -o main.o
-I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include"
-I"C:/Dev-Cpp/include/c++/3.4.2/backward"
-I"C:/Dev-Cpp/include/c++/3.4.2/mingw32"
-I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include"
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g++.exe -c Vector.cpp -o Vector.o
-I"C:/Dev-Cpp/lib/gcc/mingw32/3.4.2/include"
-I"C:/Dev-Cpp/include/c++/3.4.2/backward"
-I"C:/Dev-Cpp/include/c++/3.4.2/mingw32"
-I"C:/Dev-Cpp/include/c++/3.4.2" -I"C:/Dev-Cpp/include"
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g++.exe main.o Vector.o -o "Project1.exe" -L"C:/Dev-Cpp/lib"
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main.o(.text+0x16a):main.cpp: undefined reference to
`Vector<int>::Vector()'
main.o(.text+0x175):main.cpp: undefined reference to
`Vector<int>::~Vector()'
collect2: ld returned 1 exit status
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make.exe: *** [Project1.exe] Error 1
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Execution terminated
>
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I don't understand why I'm getting the linker error... Vector.cpp is
compiled, everything *should* be defined, no?
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Read the faq 35.15
Now, you need to catch exceptions if you are going to use them.
So i added the try-catch blocks in main.
The reason i'm adding std::bad_exception to your exception
specification in op[] is:
_If_ an exception *other* than IndexOutofBounds gets thrown from
operator[], unexpected() calls terminate() immediately. Why? because
the exception specification was *violated*.
If bad_exception is part of that function's exception specification,
then unexpected() rethrows a bad_exception. Which is nice to know cause
you'll see that in main's catch(const std::exception&) block.
Its up to you if you feel that you can do without bad_exception in your
except spec.
linker error w/ templates 
