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You can obtain a Unix timestamp using C++ by using the standard library function time and then casting the result to a time_t data type. Here's an example:

#include <iostream>
#include <ctime>

int main() {
    std::time_t result = std::time(nullptr);
    std::cout << "Unix timestamp: " << result << std::endl;
    return 0;
}

This code will output the current Unix timestamp in seconds since the Unix epoch (January 1, 1970).