compat.mio

// Behavioral test — compat.mio actually maps a file.
//
// The test writes its own file into the working directory, maps it, reads
// through the mapping and then writes through a second mapping. Nothing here
// depends on the runner's filesystem layout beyond "can create a file", which
// is true on all three CI platforms.
#include <mio/mmap.hpp>

#include <cstdio>
#include <fstream>
#include <string>
#include <system_error>

int main() {
    const std::string path = "mcpp_mio_test.bin";
    const std::string payload = "mcpp-index mio round trip";

    {
        std::ofstream out(path, std::ios::binary | std::ios::trunc);
        out.write(payload.data(), static_cast<std::streamsize>(payload.size()));
    }

// …