To convert the given function pointer `(*compare)(floata, floatb)` into a normal sorting structure, you can define a new function pointer that follows the standard comparator syntax. In C++, you can use the `std::function` template class to achieve this: ``` #include #include // for std::function #include #include // for std::sort // Define a struct to hold the float values struct FloatPair { float a; float b; }; // Function comparing two FloatPairs using (*compare)(floata, floatb) bool compareFloatPairs(FloatPair& left, FloatPair& right, std::function compare) { return compare(left.a, right.a) || (left.a == right.a && compare(left.b, right.b)); } // Example usage int main() { std::vector pairs = {{1.2, 3.4}, {5.6, 7.8}, {0.1, 2.0}}; // Define the lambda expression to be used as the compare function auto compare = [](float a, float b) { return a < b; }; // Sort the float pairs using the compare function std::sort(pairs.begin(), pairs.end(), [compare](FloatPair& left, FloatPair& right) { return compareFloatPairs(left, right, compare); }); // Print the sorted float pairs for (const auto& pair : pairs) { std::cout << pair.a << ", " << pair.b << std::endl; } return 0; } ``` In this example, `compareFloatPairs` is the function that takes two `FloatPair` instances and the comparator function (`compare`) as arguments. This function first compare the `a` values of the FloatPairs using the `compare` function. If the `a` values are equal, it then compares the `b` values. Finally, the `compareFloatPairs` function is used as the comparator for sorting the `FloatPair`s using `std::sort` in the `main` function.

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