Re: Mapping Templates function betweeen 2 class
* yogesh:
I need to know how to solve this problem of the code ,
I'm not sure how this one slipped past moderation, but the moderators
(praise be
upon them![1] :-)) are only human.
This is clearly homework and as such, the article should have been rejected.
Note that if you don't do your homework yourself, but just ask others to do
it,
you will only be postponing the point where you're unable to proceed with
the
course (or some other course). And on the way you will then have wasted
other's
time and money, namely those helping you, and your own or your family's
money,
because instead of paying tuition and not earning wages and then failing the
course or some later course, you could have been working /earning/ money.
Also,
please don't post the same article independently to many newsgroups, because
that is an additional waste of time for those wishing to help you, and for
readers.
kindly help me if any one know this
given 2 classes A and B defined as follows
struct A { int a; }
struct B { int b; char c; }
the requirement is to efficiently write 2 map classes
1. class AMap
It should have member functions similar to below
add (const std::string name, A*)
A* get (const std::string name)
remove(const std::string name)
2. class BMap
It should have member functions similar to below
add (const std::string name, B*)
B* get (const std::string name)
remove(const std::string name)
Note that in the above add/get/remove functions, I have
deliberately not provided the correct signatures as that is what you
need to create.
The above paragraph is a message from your teacher to you. He or she is
hinting
that the signatures are not perfect. Consider references instead of
pointers.
Add a main routine that exercises all the above functions
no extra libs like glib should be used; STL may be used
If you can use "STL", presumably meaning the C++ standard library, then one
way
to cheat would be to use std::map. However, I'm sure your teacher meant
that
you could use the standard C++ library in your test program, and that you
should
not use std::map in the implementation of the two classes AMap and BMap.
Essentially your teacher is asking you to create two classes AMap and BMap
akin
to std::map, except not as a template class that can handle any kinds of
keys
and values, but just handling strings as keys, and A and B as values. The
requirement of "efficiently" probably means that a linear search for a key
is
not sufficient except as an optimization for small number of keys. The
general
search must use e.g. a binary search or a hash table lookup.
Presumably the intent is to then let you realize that the two classes AMap
and
BMap are (or could be) identical except for the value type that a key
retrieves,
and then to introduce you to templates, where instead of two distinct
classes
AMap and BMap you can just write one general template class, like std::map.
Cheers, & hth.,
- Alf
Notes:
[1] We do receive praise for our work, thank you all. Also many many thanks
to
those who report problems. Without knowing about problems we can't fix
them.
--
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A: Top-posting.
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