boost/libs/leaf/examples/print_file

Print File Example

This directory has several versions of the same simple program (which reads a file, prints it to standard out and handles errors using LEAF) presented in the Five Minute Introduction, each using a different error handling style:

Using exception handling:

• print_file_eh.cpp throws on error, using an exception type hierarchy for classification of failures.

• print_file_eh_error_tags.cpp throws std::exception on error, using a novel mechanism for classification of failures.

Using a result<T> type:

• 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_result_error_tags.cpp reports errors with leaf::result<T>, using a novel mechanism for classification of failures.