Shared ownership of a single C array.
Tracks offset and length for each instance
allowing each owner to "view" a different
piece of the array.
Parts of shared_vector<T> which can work
for T=void are in shared_vector_base<T>.
Specializations shared_vector<void>
and shared_vector<const void> handle
un-typed arrays.
Allow casting to/from typed vector
Offsets and sizes of untyped vectors are tracked in
bytes. Therefore casting to types where sizeof(T)>1
is undefined if the offset is not a multiple of
sizeof(T).
Define THROW_EXCEPTION(E) which takes an exception class instance,
and uses it to construct an instance of a class which is a subclass
of E and ExceptionMixin. The original instance is discarded, and
the newly constructed sub-class is thrown. Equivalent to
"throw E;".
Define THROW_EXCEPTION2(ETYPE,MSG) which takes an exception class
type, and argument. Directly constructs a ExceptionMixin sub-class
with the given message argument. Equivalent to
"throw ETYPE(MSG);".
Define PRINT_EXCEPTION2(E, FP) If E is a instance of a sub-class of
ExceptionMixin then write information to FP (FILE*).
Define SHOW_EXCEPTION(E) If E is a instance of a sub-class of
ExceptionMixin then return a std::string with information.
