[Mysqlcppapi-forge] [ mysqlcppapi-Patches-784120 ] Iterator typedef problems

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Patches item #784120, was opened at 2003-08-06 11:40
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Jonathan Wakely (redi)
Assigned to: Nobody/Anonymous (nobody)
Summary: Iterator typedef problems

Initial Comment:
The definition of class subscript_iterator (in
mysqlcppapi/const_subscript_container.h) has a couple
of problems.

I think the template parameters given to
subscript_iterator's base class are wrong. The third
param is the iterator's difference_type, which must be
a signed type. The parameter given is "typename
OnType::size_type", which is an unsigned type. This
doesn't actually cause any problems, because
difference_type is re-declared correctly later in the
subscript_iterator body.

The second problem is simply that subscript_iterator
inherits from std::iterator. This struct isn't
available in the C++ library supplied with GCC 2.95,
which prevents that compiler being used. The workaround
is to remove the inheritance relationship and declare
the iterator_category, value_type, point, reference and
difference_type explicily (all std::iterator does is
declare these typedefs anyway). This is
standard-conforming and loses nothing, but adds
backward-compatibility.

This patch removes the inheritance and explicitly
declares the required typedefs, so that gcc 2.95 can be
used to compile the library.

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