[boost] [optional] compatibility with arrays

Subject: [boost] [optional] compatibility with arrays
From: Craig Henderson (cdm.henderson_at_[hidden])
Date: 2009-09-07 17:37:35

I am using boost::optional but have hit a problem with arrays. Using MSVC8,
the definition

 

boost::optional<char[R] > foo_;

 

produces a compilation error:

 

boost_1_39_0\boost/optional/optional.hpp(315) : error C2075: 'Target of
operator new()' : array initialization needs curly braces

boost_1_39_0\boost/optional/optional.hpp(314) : while compiling class
template member function 'void
boost::optional_detail::optional_base<T>::construct(const char (&))'

with

[

T=char [3]

]

boost_1_39_0\boost/optional/optional.hpp(455) : see reference to class
template instantiation 'boost::optional_detail::optional_base<T>' being
compiled

with

[

T=char [3]

]

 

There is no mention of non-arrays in the type requirements, so I don't know
if this is specific to MSVC8, or a general/known problem?

 

I have overcome the problem using boost::array

boost::optional<boost::array<char,R> > foo_;

 

Is there an opportunity to detect an array and substitute a boost::array for
the given type?

 

Thanks

-- Craig

 

Craig Henderson

 <http://craighenderson.co.uk/> http://www.craighenderson.co.uk

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