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:perator=(const vec_d&)

Any ideas, please???
jose,

 

[Pete Becker]

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:perator=(const vec_d&)

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

 

[Rolf Magnus]

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?