cppScope errorMedium

Dangling string_view to temporary std::string

Time: 0:00

BugFind the bug and fix the code

What it should do

Construct path from base folder and filename. Example: createTempPath("/tmp", "log.txt") -> "/tmp/log.txt"

What happens instead

Segmentation fault or garbage memory when reading returned string_view

#include <iostream>
#include <string>
#include <string_view>

std::string_view createTempPath(std::string folder, std::string file) {
    // Temporary std::string is destroyed at function exit, leaving string_view dangling
    std::string fullPath = folder + "/" + file;
    return fullPath;
}

int main() {
    std::cout << createTempPath("/tmp", "log.txt") << std::endl;
    return 0;
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

2:00 remaining

Take a moment to read the bug symptom and trace the code with Run & Check before unlocking Hint 1.

Hint 2

Unlocks after Hint 1

Hint 3

Unlocks after Hint 2

This bug belongs to the scope and closure bugs pattern

Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.

Learn the scope and closure bugs pattern Step through your own code

<iframe src="https://trybughunt.com/embed/2b5aee42-4e8e-4e94-a9b7-1c1f86f7b05e" title="Debugging challenge: Dangling string_view to temporary std::string" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe> <p style="font-size:14px">Debugging challenge from <a href="https://trybughunt.com/challenges/2b5aee42-4e8e-4e94-a9b7-1c1f86f7b05e">TryBugHunt</a></p>

#include <iostream> #include <string> #include <string_view> std::string_view createTempPath(std::string folder, std::string file) { // Temporary std::string is destroyed at function exit, leaving string_view dangling std::string fullPath = folder + "/" + file; return fullPath; } int main() { std::cout << createTempPath("/tmp", "log.txt") << std::endl; return 0; }

Dangling string_view to temporary std::string

What it should do

What happens instead

More scope and closure bugs to practise

Dangling string_view to temporary std::string

What it should do

What happens instead

More scope and closure bugs to practise