Can't get std::map to insert from function - function

Question

I am trying to add items to a map that is a private variable in a class based on if certain parameters are met. When I try to use the insert function for std::map or the [] operator, nothing happens. I don't even get an error. During debugging the code executes like everything is fine but the map stays empty.
I have tried multiple ways to insert to the map including the [] operator and different insert arguments.
class foo {
private:
std::map<std::string, int> map;
public:
void bar();
};
In cpp file:
void foo::bar() {
if(condition)
map.insert(std::make_pair("string", 1));
}
There are no error messages or warnings in the compiler or during debugging.

Answer 1

If the basic STD map usage works, maybe the problem sits in your condition implementation
#include <iostream>
#include <map>
class Foo {
std::map<std::string, int> map;
public:
void bar();
void print();
};
void Foo::bar() {
// if (condition) // weird condition causing failure
map.insert(std::make_pair("string", 1));
}
void Foo::print() {
std::cout << map.size() << std::endl;
std::cout << map.at("string") << std::endl;
}
int main(void) {
Foo foo;
foo.bar();
foo.print();
}