Overloading operator[] problem
From: Rui Maciel (rui_maciel_at_mail.com)
Date: 07/30/04
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Date: Thu, 29 Jul 2004 23:47:14 +0000
I'm trying to write a small matrix and vector library but while I was
doing the operator overloading part, I've stumbled on an annoying
compiler error. My guess is that my operator[] is broken but I'm not
shure. I've googled for it but unfortunately it seems that the search
engine ignores the "[]" string and all the results I got were somewhat
vague and apparently unrelated.
So, can anyone help me on this one? Here are a few code snippets which
are related to the problem and the error message.
<declaration>
<filename=cVector.hpp>
(...)
class cVector
{
private:
std::vector<T> data;
public:
(...)
T& operator[](unsigned int index);
(...)
};
(...)
<filename=utils.hpp>
(...)
template <class T>
void printh(const cVector<T> v)
(...)
</declaration>
<implementation>
<filename=cVector.hpp>
(...)
template <class T>
T& cVector<T>::operator[](unsigned int index)
{
return this->data[index];
}
(...)
<file=utils.hpp>
(...)
template <class T>
void printh(const cVector<T> v)
{
using namespace std;
cout << "[ " << v[0];
for(unsigned int i = 1; i < v.dimension(); i++)
{
cout << ", " << v[i];
}
cout << " ]" << endl;
}
(...)
</implementation>
<compiler error message>
(...)
g++ -Wall -ansi -pedantic -c main.cpp
utils.hpp: In function `void mmvp::printh(mmvp::cVector<T>) [with T =
float]':
main.cpp:18: instantiated from here
utils.hpp:16: error: no match for 'operator[]' in 'v[0]'
cVector.hpp:90: error: candidates are: T&
mmvp::cVector<T>::operator[](unsigned int) [with T = float] <near match>
utils.hpp:19: error: no match for 'operator[]' in 'v[i]'
cVector.hpp:90: error: candidates are: T&
mmvp::cVector<T>::operator[](unsigned int) [with T = float] <near match>
make: *** [main.o] Error 1
(...)
</compiler error message>
Thanks in advance
Rui Maciel
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