#include <cstdio>
#include <filesystem>
#include <iostream>
int main()
{
const std::filesystem::path old_p{std::tmpnam(nullptr)},
new_p{std::tmpnam(nullptr)};
try {
std::filesystem::rename(old_p, new_p); // throws since old_p does not exist
}
catch(std::filesystem::filesystem_error const& ex) {
std::cout
<< "what(): " << ex.what() << '\n'
<< "path1(): " << ex.path1() << '\n'
<< "path2(): " << ex.path2() << '\n';
}
}
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