[Boost-users] maps and constructor

From: Hicham Mouline (hicham_at_[hidden])
Date: 2007-12-12 15:13:39

Hello,

I am attempting to design a class:

class C {
  std::map<double, const A> ma;
  std::map<double, const B> ma;
.
public:
  C(...);
};

The keys in the 2 maps are always identical. So I could choose:

std::map<double,  const std::pair<A,B> >
or
std::map<double,  const std::pair<A,B>* >
(ps: AFAIK, using a const-ref for the pair is impossible, but possible with
some boost classes)

Q1:
Is there a difference in memory usage, in access speed or in code
readability
between the top choice and bottom ones?

Q2: 
Between the 2 bottom ones (storing the pair object in the map vs storing the
ptr)

Q3:
For users of class C, what sort of constructors should I offer?
C::C(const std::map<double, const std::pair<A,B>* >& )

Or, should I allow adding elements to the map after the object being
constructed?
C::add(double, const A&, const B&)

Are there better ways with boost classes?

Thank you for boost and your time,

Rds,