operator inheritance from a class template???

[jmborr]

Hi all,
For some reason, my derived class does not inherit the operator '=' of my base class, which is a class template, when I compile with g++
//=========== base class
template<class T>
class vec{
public:
vec &operator=( vec ) ;
};
//=========== derived class
class vec_d : vec<double> {
};
//===========

When I compile, I have the following error:
no match for `vec_d& = vec<double>' operator
candidates are: vec_d& vec_d::operator =(const vec_d&)

Any ideas, please???
jose,

[Pete Becker]

jmborr wrote:

Hi all,
For some reason, my derived class does not inherit the operator '=' of my base class, which is a class template, when I compile with g++
//=========== base class
template<class T>
class vec{
public:
vec &operator=( vec ) ;
};
//=========== derived class
class vec_d : vec<double> {
};
//===========

When I compile, I have the following error:
no match for `vec_d& = vec<double>' operator
candidates are: vec_d& vec_d::operator =(const vec_d&)

When in doubt, simplify. The problem has nothing to do with templates.
Read about assignment operators and inheritance.

--

Pete Becker
Dinkumware, Ltd. (http://www.dinkumware.com)

[Rolf Magnus]

jmborr wrote:

Hi all,
For some reason, my derived class does not inherit the operator '='
of my base class,
The reason is that operator= is never inherited.
which is a class template, when I compile with g++
//=========== base class template<class T>
class vec{
public:
vec &operator=( vec ) ;
With the above signature, the right hand vec will be copied into the
parameter before it then is copied into the this object. So you shuold
probably use a (const) reference:

vec& operator=(const vec&);
};
//=========== derived class
class vec_d : vec<double> {
};
//===========
Why don't you just typedef it?

typedef vec<double> vec_d;
When I compile, I have the following error:
no match for `vec_d& = vec<double>' operator
candidates are: vec_d& vec_d::operator =(const vec_d&)

Any ideas, please???
jose,

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First they ignore you. Then they laugh about you.
Then they fight you. And then you win.
(Mahatma Gandhi)