How to set file permissions (cross platform) in C++?

Question

I am using C++ ofstream to write out a file. I want to set the permissions to be only accessible by the user: 700. In unix; I suppose I can just issue a s

Answer 1

Cross-platform example to set 0700 for a file with C++17 and its std::filesystem.

#include 
//#include 
#include  // Use this for most compilers as of yet.

//namespace fs = std::filesystem;
namespace fs = std::experimental::filesystem; // Use this for most compilers as of yet.

int main()
{
    fs::path myFile = "path/to/file.ext";
    try {
        fs::permissions(myFile, fs::perms::owner_all); // Uses fs::perm_options::replace.
    }
    catch (std::exception& e) {
        // Handle exception or use another overload of fs::permissions() 
        // with std::error_code.
    }           
}

See std::filesystem::permissions, std::filesystem::perms and std::filesystem::perm_options.