Solved

urgent:search value in map

Posted on 2011-09-11
3
307 Views
Last Modified: 2012-05-12
Hi there,

I have a map like this:
 map<int,int> months;
months[key]=value.
I know we can find the key using the find function. months[key] but is it possible find the value of the months ?

Is it possible to search for value in a map ?
0
Comment
Question by:zizi21
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 53

Expert Comment

by:Infinity08
ID: 36521019
Sure. If you iterate over the entire map, and check every item in it.

But probably that's not what you want. Most likely, you are using the wrong data structure for your needs.
0
 

Author Comment

by:zizi21
ID: 36521042
I need to search for key and at times, the value. Is there any data structure that allows  me to do that?

I searched and there was boost bimap but they stated that make sure that this is what you are really after as it is a bit slow due to the redundancy being kept.
0
 
LVL 53

Accepted Solution

by:
Infinity08 earned 500 total points
ID: 36521566
There is indeed a trade-off to be taken into account. If you need to be able to efficiently perform lookups on both key and value, then you'll pay for that elsewhere (eg. in memory footprint, insertion time, ...).

If you only rarely have to look up a value, and the map is relatively small, and you can live with a slower performance when looking up by value, then you can keep using a map, and simply iterate over the entire contents to find the value.
If any of those preconditions are not true though, you'll likely be better off placing the trade-off elsewhere by using a different data structure.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
C++ get user from AD  (VS6) 7 111
IdTelnet1DataAvailable handler freezes the Application 4 104
thread-safe code in c++ 2 128
Autosar OS Multicore Share Resources confusion ? 2 198
Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question