Unknown type name string C++ - c++

Question

I'm new to C++ and have had some help with my program to compare two XML files. This is the code I have:
#include "pugixml.hpp"
#include <iostream>
#include <unordered_map>
int main() {
pugi::xml_document doca, docb;
std::map<string, pugi::xml_node> mapa, mapb;
if (!doca.load_file("a.xml") || !docb.load_file("b.xml"))
return 1;
for (auto& node: doca.child("site_entries").children("entry")) {
const char* id = node.child_value("id");
mapa[new std::string(id, strlen(id))] = node;
}
for (auto& node: docb.child("site_entries").children("entry"))
const char* idcs = node.child_value("id");
std::string id = new std::string(idcs, strlen(idcs));
if (!mapa.erase(id)) {
mapb[id] = node;
}
}
}
I seem to get a lot of errors when I try and compile it.
The first one I get is this:
src/main.cpp:10:14: error: unknown type name 'string'; did you mean 'std::string'?
std::map<string, pugi::xml_node> mapa, mapb;
~~~~~^~~
From what I understand, I have specified it correctly. Should I change it as it requests or is something else a-miss?

Answer 1

You need to include the string library in order to use std::string.
Since you mentioned a lot of errors, I suspect you forgot to include <cstring> in order to use strlen().
#include <string>
#include <cstring>

Answer 2

You have to include the string library:
#include <string>

Answer 3

Use the following way:
std::string varName = "var value";
I'm using Clion IDE and it worked for me.