All exceptions thrown by CoCoALib are of a type derived from CoCoA::exception.
An object of type CoCoA::exception contains just 2 fields: a message and
a context (which may be empty). The intention is that the message
indicates what caused the exception, while context may indicate where
the exception was thrown from (or it may be empty).
Note that CoCoA::exception deliberately does not derive from std::exception.
There are two constructors:
exception(mesg) specify the message but no context (i.e. empty string)
exception(mesg, where) specify the message and a context
Let E be an object of type exception
message(E) gives the message inside E as a std::string
context(E) gives the context info inside E as a std::string
The class is very simple: it contains just two string data members, and two accessor functions.
Params are now std::string rather than const std::string&
because that should be more efficient (sometimes) thanks to move-ctor:
the supplied arg is a copy, so can be moved into the data-structure.
2021
std::string (previously const std::string&)
2015