This directory has three versions of the same simple program, which reads a file, prints it to standard out and handles errors using LEAF, each using a different variation on error handling:

print_file_result.cpp reports errors with leaf::result<T>, using an error code enum for classification of failures.
print_file_outcome_result.cpp is the same as the above, but using outcome::result<T>. This demonstrates the ability to transport arbitrary error objects through APIs that do not use leaf::result<T>.
print_file_eh.cpp throws on error, using an error code enum for classification of failures.