remove value from vector c 2b 2b

1//wiki - erase-remove idiom
2// Use g++ -std=c++11 or clang++ -std=c++11 to compile.
3
4#include <algorithm>  // remove and remove_if
5#include <iostream>
6#include <vector>  // the general-purpose vector container
7
8void Print(const std::vector<int>& vec) {
9  for (const auto& i : vec) {
10    std::cout << i << ' ';
11  }
12  std::cout << '\n';
13}
14
15int main() {
16  // Initializes a vector that holds numbers from 0-9.
17  std::vector<int> v = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
18  Print(v);
19
20  // Removes all elements with the value 5.
21  v.erase(std::remove(v.begin(), v.end(), 5), v.end());
22  Print(v);
23}
24
25/*
26Output:
270 1 2 3 4 5 6 7 8 9
280 1 2 3 4 6 7 8 9
29
30*/

1#include <algorithm>
2#include <vector>
3
4// using the erase-remove idiom
5
6std::vector<int> vec {2, 4, 6, 8};
7int value = 8 // value to be removed
8vec.erase(std::remove(vec.begin(), vec.end(), value), vec.end());

1std::vector<int> v; 
2// fill it up somehow
3v.erase(std::remove(v.begin(), v.end(), 99), v.end()); 
4// really remove all elements with value 99

1vector.erase(position) // remove certain position
2// or
3vector.erase(left,right) // remove positions within range
4

1
2
3// erase element from vector by its index
4    vector<string> strs {"first", "second", "third", "last"};
5      
6    string element = "third"; // the element which will be erased
7    for(int i=0;i<strs.size();i++)
8    {
9      if(strs[i] == element)
10      strs.erase(strs.begin()+i);
11    }
12    
13

1// Why not setup a lambda you can use again & again
2auto removeByIndex = 
3  []<class T>(std::vector<T> &vec, unsigned int index)
4{
5	// This is the meat & potatoes
6  	vec.erase(vec.begin() + index);
7};
8
9// Then you can throw whatever vector at it you desire
10std::vector<std::string> stringvec = {"Hello", "World"};
11// Will remove index 1: "World"
12removeByIndex(stringvec, 1);
13// Vector of integers, we will use push_back
14std::vector<unsigned int> intvec;
15intvec.push_back(33);
16intvec.push_back(66);
17intvec.push_back(99);
18// Will remove index 2: 99
19removeByIndex(intvec, 2);