Re: Getting struct fields info at runtime?
"Barry Schwarz" <schwarzb@doezl.net> wrote in message
news:u7o6l3l8583k562lb5tl6s4b2kd6ae73hn@4ax.com...
On Fri, 30 Nov 2007 13:42:53 -0000, "David Webber"
<dave@musical-dot-demon-dot-co.uk> wrote:
"Robert" <r@none.com> wrote in message
news:epJeVQ0MIHA.3852@TK2MSFTNGP06.phx.gbl...
And also, even if I use inheritance, if in the new StructVersion2
instead
of adding fields I have just to increment the length of a char[] field,
if
I try to use an instruction such as this
what will be the behaviour of the assignment?
The position of the fields doesn't correspond, so will I get an error?
You shouldn't do anything with C++ structs or classes which depends on the
position of the fields. IIRC it is not defined by the compiler, and next
time you compile with a new compiler it may put them in a different order
in
memory. (One exception I would make is avoiding bit fields which go
across
packing boundaries - but that may be my personal taste.)
In structures at least, the order of members cannot be changed by the
compiler. However, different compilers can enforce different
alilgnments and use different paddings.
You probably meant POD-types. In C++ there is no distinction between
structures and classes, either can be a POD-type which is sequentially
ordered, or an object type where ordering is completely at the whim of the
compiler.
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