cppLogic errorMedium

Crash on custom class destruction without copy constructor

Time: 0:00

BugFind the bug and fix the code

What it should do

Process data stored in a custom class. Example: processDataCopyConstructor(data) -> void

What happens instead

Double free or corruption error during program execution.

#include <iostream>
#include <string>

class Data {
private:
    std::string* content;
public:
    Data(const std::string& str) : content(new std::string(str)) {}
    ~Data() { delete content; }
    std::string getData() const { return *content; }
};

void processDataCopyConstructor(Data data) {
    std::cout << "Processing: " << data.getData() << std::endl;
}

int main() {
    Data d("Hello");
    processDataCopyConstructor(d);
    return 0;
}

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

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Hint 3

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This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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#include <iostream> #include <string> class Data { private: std::string* content; public: Data(const std::string& str) : content(new std::string(str)) {} ~Data() { delete content; } std::string getData() const { return *content; } }; void processDataCopyConstructor(Data data) { std::cout << "Processing: " << data.getData() << std::endl; } int main() { Data d("Hello"); processDataCopyConstructor(d); return 0; }

Crash on custom class destruction without copy constructor

What it should do

What happens instead

More logic errors to practise

Crash on custom class destruction without copy constructor

What it should do

What happens instead

More logic errors to practise