Re: [Boost-users] [type_traits]: is_boost_optional?

Zitat von Roland Bock :

On 2010-09-01 15:30, Stefan Strasser wrote:

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Zitat von Roland Bock :

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Hi,

is there something in Boost.TypeTraits (or somewhere else) that allows me to check if a type is a boost::optional?

I'd like to do something like this:

template<typename T> typename enable_if, T::value_type>::type foo(const T&);

there is nothing in type traits, but you can easily check for a specific (template) type:

template<typename T> struct is_optional : mpl::false_{};

template<typename T> struct is_optional : mpl::true_{};

cerr << is_boost_optional::value << endl;

yields: 0 expected: 1

?? http://boost.codepad.org/2xsgt6AH