Re: Using a std::set ordering predicate with ctor arguments
In article <Xns98CEB5EA9A312wrgrpde@news.albasani.net>, Wolfram Roesler
<wr@spam.la> wrote:
Hello all,
I know how to write a functor class to specify the ordering predicate
used by a std::set, something like this:
class Order
{
public:
bool operator()(MyType const &a,MyType const &b) const;
};
std::set<MyType,Order> MySet;
My question is, is it possible to use an ordering class that requires
constructor arguments? As in,
class Order2
{
public:
Order2(SomeType const &s);
bool operator()(MyType const &a,MyType const &b) const;
};
In my application, the Order2 ctor would store some information from
the SomeType object in a private class member in order to make it
available to the operator() function.
Is there any way to get this done?
looks like:
class MyOrder
{
// stuff to copy from SomeType
public:
explicit Myorder(const SomeType &st)
{
// copy data from st to the private data
}
bool operator () (MyType const &a,MyType &b)const
{
// ...
}
};
SomeType some;
// initailize some.
std::set<MyType,MyOrder> foo(MyOrder(some));
// ...
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