CPP

if vector contains value c++

#include <algorithm>

if(std::find(v.begin(), v.end(), x) != v.end()) {
    /* v contains x */
} else {
    /* v does not contain x */
}

check if an item is in a vector c++

bool Movies::add_movie(std::string name, std::string rating, int watched) {
    Movie pass(name,rating,watched);
    for(int i{0}; i < movies.size(); i++){
        if(movies.at(i).get_name() == name){
            return false;
        }
    }
    movies.push_back(pass);
    return true;
}