Use find() and find_if() on a vector of strings. - C++ STL Algorithm

C++ examples for STL Algorithm:find

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Description

Use find() and find_if() on a vector of strings.

Demo Code

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
bool is_short_str(string str);
int main()// ww w  .  jav  a 2s  .c o  m
{
   vector<string> v;
   vector<string>::iterator itr;
   v.push_back("one");
   v.push_back("two");
   v.push_back("three");
   v.push_back("four");
   v.push_back("five");
   v.push_back("six");
   cout << "Contents of v: ";
   for(unsigned i=0; i < v.size(); ++i)
      cout << v[i] << " ";
   cout << "\n\n";
   // Find the element that contains "two".
   cout << "Searching for \"two\"\n";
   itr = find(v.begin(), v.end(), "two");
   if(itr != v.end()) {
      cout << "Found \"two\", Replacing with \"TWO\"\n";
      *itr = "TWO";
   }
   cout << endl;
   // Find all strings that are less than 4 characters long.
   cout << "Searching for all strings that have 3 or fewer characters.\n";
   itr = v.begin();
   do {
      itr = find_if(itr, v.end(), is_short_str);
      if(itr != v.end()) {
         cout << "Found " << *itr << endl;
         ++itr;
      }
   } while(itr != v.end());
   return 0;
}
// Return true if the string is 3 characters or less.
bool is_short_str(string str)
{
   if(str.size() <= 3) return true;
   return false;
}

Result


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