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Why does the std::find for vector return a iterator instead of the integer position

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1

Why does the vector find return the iterator instead of the integer value?

vector<string>::iterator itr1 = std::find(words.begin(), words.end(), word);

c++ std

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edited 8 hours ago

Casey

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7

1

Why does the vector find return the iterator instead of the integer value?

vector<string>::iterator itr1 = std::find(words.begin(), words.end(), word);

c++ std

share|improve this question

edited 8 hours ago

Casey

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asked 8 hours ago

GaniGani

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New contributor

Gani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Why does the vector find return the iterator instead of the integer value?

vector<string>::iterator itr1 = std::find(words.begin(), words.end(), word);

c++ std

share|improve this question

edited 8 hours ago

Casey

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asked 8 hours ago

GaniGani

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Gani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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vector<string>::iterator itr1 = std::find(words.begin(), words.end(), word);

share|improve this question

edited 8 hours ago

Casey

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asked 8 hours ago

GaniGani

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Gani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question

edited 8 hours ago

Casey

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asked 8 hours ago

GaniGani

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Gani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 8 hours ago

Casey

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edited 8 hours ago

Casey

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asked 8 hours ago

GaniGani

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Gani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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12

std::find works for all sorts of containers, not just std::vector. For example, it works with std::list but that container does not allow accessing elements by index (at least not easily). For it to work with all kinds of containers it needs to return something all containers understand, an iterator.

Edit : If you want to find the index position equivalent to a given iterator, you can use std::distance. For example :

std::distance(std::begin(words), itr1);

This will work for standard containers but it may be slower for some. It returns the size of the container if the element is not found, since find returns end if it fails to find the element and the distance between begin and end is the size of the container.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to find all the indexes of occurrences of the word in the vector?
  
  – Gani
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Gani Yes, perform the search in a loop. Instead of searching from begin to end, replace begin by the iterator following the last one you found. I don't think the standard library has a function for that.
  
  – François Andrieux
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Gani: Why do you want indices so badly? What's wrong with using iterators?
  
  – Nicol Bolas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Iterators are the glue that holds containers and algorithms together. I've seen several 3rd party collection libraries, and none of them had iterators. They also didn't have algorithms because they (we) couldn't get them to work with enough containers without 'em.
  
  – Mark Storer
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicolBolas I am working on some algorithm which needs all the indexes to be stored in the vector. Its easy to code for it but I was just curious if the STL library has something for me.
  
  – Gani
  4 hours ago
  

  
  
  
  

 | 
show 1 more comment

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12

std::find works for all sorts of containers, not just std::vector. For example, it works with std::list but that container does not allow accessing elements by index (at least not easily). For it to work with all kinds of containers it needs to return something all containers understand, an iterator.

Edit : If you want to find the index position equivalent to a given iterator, you can use std::distance. For example :

std::distance(std::begin(words), itr1);

This will work for standard containers but it may be slower for some. It returns the size of the container if the element is not found, since find returns end if it fails to find the element and the distance between begin and end is the size of the container.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to find all the indexes of occurrences of the word in the vector?
  
  – Gani
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Gani Yes, perform the search in a loop. Instead of searching from begin to end, replace begin by the iterator following the last one you found. I don't think the standard library has a function for that.
  
  – François Andrieux
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Gani: Why do you want indices so badly? What's wrong with using iterators?
  
  – Nicol Bolas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Iterators are the glue that holds containers and algorithms together. I've seen several 3rd party collection libraries, and none of them had iterators. They also didn't have algorithms because they (we) couldn't get them to work with enough containers without 'em.
  
  – Mark Storer
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicolBolas I am working on some algorithm which needs all the indexes to be stored in the vector. Its easy to code for it but I was just curious if the STL library has something for me.
  
  – Gani
  4 hours ago
  

  
  
  
  

 | 
show 1 more comment

12

std::find works for all sorts of containers, not just std::vector. For example, it works with std::list but that container does not allow accessing elements by index (at least not easily). For it to work with all kinds of containers it needs to return something all containers understand, an iterator.

Edit : If you want to find the index position equivalent to a given iterator, you can use std::distance. For example :

std::distance(std::begin(words), itr1);

This will work for standard containers but it may be slower for some. It returns the size of the container if the element is not found, since find returns end if it fails to find the element and the distance between begin and end is the size of the container.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to find all the indexes of occurrences of the word in the vector?
  
  – Gani
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Gani Yes, perform the search in a loop. Instead of searching from begin to end, replace begin by the iterator following the last one you found. I don't think the standard library has a function for that.
  
  – François Andrieux
  8 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @Gani: Why do you want indices so badly? What's wrong with using iterators?
  
  – Nicol Bolas
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Iterators are the glue that holds containers and algorithms together. I've seen several 3rd party collection libraries, and none of them had iterators. They also didn't have algorithms because they (we) couldn't get them to work with enough containers without 'em.
  
  – Mark Storer
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicolBolas I am working on some algorithm which needs all the indexes to be stored in the vector. Its easy to code for it but I was just curious if the STL library has something for me.
  
  – Gani
  4 hours ago
  

  
  
  
  

 | 
show 1 more comment

std::find works for all sorts of containers, not just std::vector. For example, it works with std::list but that container does not allow accessing elements by index (at least not easily). For it to work with all kinds of containers it needs to return something all containers understand, an iterator.

Edit : If you want to find the index position equivalent to a given iterator, you can use std::distance. For example :

std::distance(std::begin(words), itr1);

This will work for standard containers but it may be slower for some. It returns the size of the container if the element is not found, since find returns end if it fails to find the element and the distance between begin and end is the size of the container.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges

share|improve this answer

edited 8 hours ago

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges

answered 8 hours ago

François AndrieuxFrançois Andrieux

17.9k33 gold badges3131 silver badges5252 bronze badges