难以理解boost copy_file“文件存在”错误消息

Question

I am investigating an issue in my program where the following error message appears:

boost::fs: boost::filesystem::copy_file: File exists: "path/to/file1", "path/to/file2" path1="path/to/file1" path2="path/to/file2"

I guess the issue is that some file already exists and that overwriting it is impossible, but I am not sure which file exactly.

Is it file1 that can't be copied to path/to/file2 or the opposite? Or something else entirely?

Answer 1

The boost documentation Here says the following:

void         copy_file(const path& from, const path& to);
void         copy_file(const path& from, const path& to,
                   system::error_code& ec);
void         copy_file(const path& from, const path& to,
                   copy_option option);
void         copy_file(const path& from, const path& to,
                   copy_option option, system::error_code& ec);

Also, you can check if a file exists using:

if ( !boost::filesystem::exists( "myfile.txt" ) )
{
  std::cout << "Can't find my file!" << std::endl;
}