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C++ Fundamentals for Professionals

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Understand how to bind variables as copies in lambda functions to prevent undefined behavior from destroyed references. This lesson clarifies key concepts in function behavior, preparing you to work effectively with C++ classes and objects.

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Solution #

C++
#include <functional>
#include <string>
#include <iostream>
std::function<std::string()> makeLambda() {
  const std::string val = "on stack created";
  return [val]{return val;};
}
int main(){
  std::cout << std::endl;
  auto bad = makeLambda();
  std::cout << bad() << std::endl;
  std::cout << std::endl;
}

Explanation

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