Segmentation Fault when Using std::map with Custom Comparator in C++11
I keep running into I'm experiencing a segmentation fault when attempting to use an `std::map` with a custom comparator in my C++11 application. I have a custom structure `Point` which holds coordinates, and I've implemented a comparator to sort these points based on their distance from the origin. However, when I try to insert elements into the map, the program crashes unexpectedly. Here's the code snippet that illustrates my setup: ```cpp #include <iostream> #include <map> #include <cmath> struct Point { int x, y; Point(int x, int y) : x(x), y(y) {} }; struct CompareDistance { bool operator()(const Point& a, const Point& b) const { return std::sqrt(a.x * a.x + a.y * a.y) < std::sqrt(b.x * b.x + b.y * b.y); } }; int main() { std::map<Point, std::string, CompareDistance> pointMap; pointMap.emplace(Point(3, 4), "Point A"); // Segmentation fault occurs here return 0; } ``` The behavior occurs on the line where I try to insert `Point(3, 4)`. I've verified that the comparator is functioning as expected and that the `Point` structure is correctly defined. I suspect the scenario might be related to how `std::map` handles key comparisons, but I'm not entirely sure. Can anyone help identify why I'm working with this segmentation fault? I've also checked that my compiler version is GCC 9.3.0, and I am compiling with `-std=c++11`. Any insights would be greatly appreciated! I'm working on a web app that needs to handle this. Thanks in advance! This is happening in both development and production on CentOS. Any suggestions would be helpful.