Re: [Boost-Users] Boost Array Question

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2002-01-15 21:20:59

If I remember right, the use of inheritance means that your test_array is
not an "aggregate" type according to the C++ std, and can not be
initialize with {}'s.

Why don't you create your associative array-like interface via
free-functions in terms of boost::array itself? Member functions are lame
anyways ;)

Cheers,
Jeremy

On Tue, 15 Jan 2002, Duane Murphy wrote:

> Below is a simple example that I cannot get to compile. I would like to
> create a subclass of boost::array in order to give it some additional
> functionality (I would like a associative array like interface).
>
> When I compile this, I get an "illegal initialization" error for test.
>
> I am using Metrowerks Codewarrior 7 on Mac OS X.
>
> Is there some special incantation required? I suspect that I am in some
> kind of specialized area and I cant get there from here.
>
> template < class T, std::size_t N >
> struct test_array : public boost::array< T, N >
> {
> };
>
> static boost::array< char,1 > array_test = {{ 'a' }};
> static test_array< char, 1 > test = {{ 'a' }};
>
> It appears that if I aggregate instead of inherit that this might work
> (at least it compiles :-)
>
> template < class T, std::size_t N >
> struct test_array
> {
>     boost::array< T, N > array_;
> };
>
> static boost::array< char,1 > array_test = {{ 'a' }};
> static test_array< char, 1 > test = {{ 'a' }};
> // The funny thing is this works also:
> static test_array< char, 1 > test2 = { 'a' };
>
> TIA,
>  ...Duane
>
>
>
>
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>

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 Jeremy Siek                          http://www.osl.iu.edu/~jsiek/
 Ph.D. Student, Indiana Univ. B'ton   email: jsiek_at_[hidden]
 C++ Booster (http://www.boost.org)   office phone: [phone]
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