Technology

Functor for deleting objects

In a destructor for a class, I had a std::vector of pointers that I wanted to delete. I started to write the usual for(;;) loop and realized I do this often enough I should make it easy to use std::for_each().
Here’s the functor (based on std::unary_function):

template
struct deleter: public std::unary_function
{
    bool operator()(Type * ptr) const
    {
        delete ptr;
        return true;
    }
};

And here’s some sample code using it:

std::vector m_symbols;
// ...
std::for_each (m_symbols.begin(), m_symbols.end(), deleter());

I added a return of true because some other template code wasn’t happy about “return void” — supposedly something fixed in recent compilers.

Standard

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