Finding keyword in strings c++ - c++

Question

I'm still fairly new to C++ and programming so I might just be missing something big here.
I'm trying to create a chatbot for a library, deals with opening times ect and other things. I want the chatbot to be able to pickup key words in a input and then be able to call the right function that will be able to give some text back to them.
For example:
user: what time is the library open till?
//chatbot picks up the key word 'open' and returns the right function
chatbot: the libraries open between 6 and 5
It shouldn't be as hard as I am finding it to be able to get the chatbot to do this.
The function I'm having trouble with:
std::string GetKeywords(){
std::string KQuery = GetQuery();
std::vector<std::string> keywords{"open", "opening", "times", "close", "closing", "shut"};
if(std::find(keywords.begin(), keywords.end(), KQuery) != keywords.end()){
std::cout << "Library is open when I say it is" << std::endl;
}
return 0;
};
This is returning a memory error and is the only place in my code which throws an issue.
All my code:
#include <iostream>
#include <string>
#include <vector>
#include "FinalProject.hpp"
//introducing funtions
void PrintIntro();
std::string GetQuery();
std::string RunScripts();
std::string GetKeywords();;
// introducing chatbot
RunScript ChatBot;
int main(){
PrintIntro();
GetQuery();
GetKeywords();
};
void PrintIntro(){
//printing introductory text to ask the user for input
std::cout << "Hi, I'm Librarius, I'm here to help you with University library queries" << std::endl;
std::cout << "I can help you with the following: \n Spaces to study \n Opening times \n Taking out books \n Returning books\n" << std:: endl;
std::cout << "Ask away!" << std::endl;
return;
};
std::string GetQuery(){
//getting input from the user
std::string Query = "";
std::getline(std::cin, Query);
if(Query.empty()){
//checking to see if the user hasnt entered anything
std::cout << "Hey! Why didnt you enter anything?! I don't want to waste my time!" << std::endl;
};
return Query;
};
std::string GetKeywords(){
std::string KQuery = GetQuery();
std::vector<std::string> keywords{"open", "opening", "times", "close", "closing", "shut"};
if(std::find(keywords.begin(), keywords.end(), KQuery) != keywords.end()){
std::cout << "Library is open when I say it is" << std::endl;
}
return 0;
};
//using the input got from the user to decide which script to run
//TODO analyse the users keywords and decide on a script to run
//TODO return an appropriate script
Thanks for your help!

Answer 1

The problem with
std::find(keywords.begin(), keywords.end(), KQuery)
is it is going to see if the entire string in KQuery matches one of your keywords. Since KQuery has a sentence in it, it isn't going to find a match. What you need to do is loop through all the keywords and see if KQuery.find(keyword) returns a valid result.
You can do that using std::find_if and a lambda like
std::find_if(keywords.begin(), keywords.end(),
[&](auto const& keyword){ return KQuery.find(keyword) != std::string::npos; });
This will return an iterator to the first keyword it finds in KQuery or keywords.end() if none of the keywords are found.