In C ++, check if std :: vector <string> contains a specific value

Question

Is there a built-in function that tells me that my vector contains a specific element or not for example.

std::vector<string> v; v.push_back("abc"); v.push_back("xyz"); if (v.contains("abc")) // I am looking for one such feature, is there any // such function or i need to loop through whole vector? 

Answer 1

You can use std::find as follows:

 if (std::find(v.begin(), v.end(), "abc") != v.end()) { // Element in vector. } 

To use std::find : include <algorithm> .

Answer 2

• If your container contains only unique values, use std::set instead. It allows you to request a given membership with logarithmic complexity.

   std::set<std::string> s; s.insert("abc"); s.insert("xyz"); if (s.find("abc") != s.end()) { ... 

• If your vector is sorted, use std::binary_search , it also offers logarithmic complexity.

• If all else fails, return to std::find , which is a simple linear search.

Answer 3

In C ++ 11, you can use std :: any_of instead.

Answer 4

in <algorithm> and is called std::find .

Answer 5

std::find() .