segmentation_fault.cpp

#include <string>
#include <iostream>
#include <memory>

class Foo {
public:
    Foo(char *chars) {
      std::cout << *(data.get()) << std::endl;
      data = std::unique_ptr<std::string>(new std::string(chars));
    }

    std::unique_ptr<std::string> data;
};

int main() {
    char str[2] = {42, 0};

    Foo foo = {str};

    std::cout << "2: " << *(foo.data.get()) << std::endl;
}