How do I interoperate with C APIs std::pair in C++?

Interoperating with C APIs in C++ can be achieved by wrapping C data types with C++ constructs. One common scenario involves using `std::pair` to hold two related values. When working with C APIs that do not directly support C++ constructs, you can define a C-compatible struct that mimics the behavior of `std::pair`, facilitating smoother integration.

Example of Interoperating with C APIs using std::pair

In this example, we will define a C-compatible structure that represents a pair of integers, and we will also show how to use it with C functions.

// C-compatible Pair struct typedef struct { int first; int second; } IntPair; // Function to create a pair IntPair create_pair(int a, int b) { IntPair p; p.first = a; p.second = b; return p; } // Function to print pair values void print_pair(IntPair p) { printf("First: %d, Second: %d\n", p.first, p.second); } // Example usage #include int main() { IntPair myPair = create_pair(1, 2); print_pair(myPair); return 0; }

C++ C APIs std::pair interoperability

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