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C++ class template, how to overload [ ] operator in a specific stuation?


C++ class template, how to overload [ ] operator in a specific stuation?

By : TedZad
Date : November 21 2020, 03:00 PM
I wish this helpful for you 'const print' is used if the object has the 'const' qualifier on it. Otherwise the other form is used. In your case none of the 'Test' instances are 'const', so non-const versions of print are used:
code :
T& operator[](int a)
...
arr[1].print(); 
Test &t1 = arr[2];
t1.print();
T& operator[](int a)
...
arr[1].print(); 
const Test &t2 = arr[2];
t2.print();
const T& operator[](int a)
...
arr[1].print(); 
const Test &t1 = arr[2];
t1.print();


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overload operator<< for class template

overload operator<< for class template


By : Tanya Amos
Date : March 29 2020, 07:55 AM
Hope this helps let's take this code to implement the operator<< for two classes: , Same as above:
code :
template< class T>
std::ostream& operator<<(std::ostream& os, const T& in)
{
    return in.print(os);
}
template<int X, typename T>
struct enabler
{
    typedef T type;
};
template<class T>
typename enabler< sizeof(&T::print), std::ostream&>::type
operator << (std::ostream &o, const T &t)
{
    t.print(o);
    return o;
}
Overload output stream operator of a template class outside of the template

Overload output stream operator of a template class outside of the template


By : Ramanand Sharma
Date : March 29 2020, 07:55 AM
I think the issue was by ths following ,
Can anybody give a simple example on how can the output stream operator << defined outside a template class?
code :
// Declare the class template, because we need it to declare the operator
template <typename,int,template <class C> class,typename> class MyContainer;

// Declare the operator, because (as the error says) templates must be declared
// in the namespace before you can declare them friends. At this point, we can't
// define the operator, since the class template is incomplete.
template 
<typename T,int _MaxSize,template <class C> class Policy,typename Container>
std::ostream& operator<<(std::ostream&,MyContainer<T,_MaxSize,Policy,Container>);

// Define the class template
template
<typename T,int _MaxSize=10,template <class C> class Policy=NoCheck,typename Container=std::vector<T>>
class MyContainer : public Policy<T>
{
public:
  MyContainer():p(_MaxSize){};

  // Include <> to indicate that this is the template
  friend std::ostream& operator<< <>(std::ostream& out,MyContainer<T,_MaxSize,Policy,Container> obj);
private:
  Container p;
};

// Finally define the operator
template
<typename T,int _MaxSize,template <class C> class Policy,typename Container>
std::ostream& operator<<(std::ostream& out,MyContainer<T,_MaxSize,Policy,Container> obj)
{
  // print some stuff
};
operator = overload in template class

operator = overload in template class


By : Diego Ja. Gonzalez F
Date : March 29 2020, 07:55 AM
This might help you Use std::vector as storage (instead of manal new and delete), and just accept the copy assignment operator generated by the compiler. It's that easy.
code :
// In class definition:
friend
void swap( Matrix& a, Matrix& b )
    noexcept
{
    using std::swap;
    // swap all data members here
}
// In class definition
auto operator=( Matrix other )
    -> Matrix&
{
    swap( *this, other );
    return *this;
}
Template class with operator overload

Template class with operator overload


By : Theo
Date : March 29 2020, 07:55 AM
With these it helps Here is my question about template class , You can have member function templates inside your class template:
code :
template <typename T>
struct aclass
{
    aclass(aclass const &) = default;
    aclass & operator=(const aclass &) = default;

    template <typename U>
    aclass(aclass<U> const & rhs) : a_(rhs.a_), b_(rhs.b_) {}

    template <typename U>
    aclass & operator=(aclass<U> const & rhs)
    {
        a_ = rhs.a_;
        b_ = rhs.b_;
        return *this;
    }

    T a_, b_;
};
assignment operator overload on a template class with template parameters

assignment operator overload on a template class with template parameters


By : Pramod Kumar P C
Date : March 29 2020, 07:55 AM
it should still fix some issue iterator's first template parameter is a template template parameter. That is, it should take a template as its argument. You can't give Cont because that is a specific instantiation of a template. Try:
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