A what() Built from a Stored String

std::exception itself stores no message, so a class that inherits from it directly has to keep its own text and return it from what(). Build from scratch:

- ValidationFailure inherits from std::exception: explicit ValidationFailure(const std::string& text) stores the text in a private std::string; const char* what() const noexcept override returns the C string inside it (.c_str()) - RangeFailure inherits from ValidationFailure: RangeFailure(const std::string& field, int limit) passes the text made of the field, above and the limit to the base, and stores the limit for int limit() const - void checkSpeed(int speed): a speed below 0 throws ValidationFailure("speed is negative"); a speed above 120 throws RangeFailure("speed", 120); otherwise it prints speed ok: and the speed

The tests read speeds from input, one per line, and print range: , what(), (limit , the limit and ) for a RangeFailure, invalid: and what() for any other ValidationFailure, or the ok line. For the first test the input is 60, 130, -5.

Do NOT write a main function.

Expected Output:

speed ok: 60↵
range: speed above 120 (limit 120)↵
invalid: speed is negative↵

= newline. The output ends with a newline — print one after the last line.

Hints4 available

Topics:

Exceptions

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