AMDG On 06/18/2012 09:45 AM, lcaminiti wrote:
lcaminiti wrote
I will use the lib in some use cases that I ran into the past and let you know if I find a nice example not too complex (I don't remember what the use cases were but they were about type erasure).
Why this does not compile?
"abc" is an array. I guess this means that the constructor of any needs to handle array-to-pointer decay. Until I fix this, you can use (const char*)"abc".
#include <boost/type_erasure/any.hpp> #include <boost/type_erasure/builtin.hpp> #include <boost/type_erasure/operators.hpp> #include <boost/mpl/vector.hpp> #include <iostream>
struct display { public: template< typename T > explicit display ( T const& obj ) : obj_(obj) {}
public: void print ( void ) { std::cout << obj_ << std::endl; }
private: boost::type_erasure::any< boost::mpl::vector< boost::type_erasure::copy_constructible<> , boost::type_erasure::typeid_<> , boost::type_erasure::ostreamable<> > > obj_; };
int main ( void ) { display i(123), s("abc"); i.print(); s.print(); return 0; }
Using GCC 4.5.3 on Cygwin with Boost 1.50.0 Beta 1, I get:
In file included from ../boost/type_erasure/detail/access.hpp:14:0, from ../boost/type_erasure/any.hpp:34, from 01.cpp:2: ../boost/type_erasure/detail/storage.hpp: In constructor ‘boost::type_erasure::detail::storage::storage(const T&) [with T = char [4]]’: ../boost/type_erasure/any.hpp:167:22: instantiated from ‘boost::type_erasure::any<Concept, T>::any(const U&) [with U = char [4], Concept = boost::mpl::vector<boost::type_erasure::copy_constructible<>, boost::type_erasure::typeid_<>, boost::type_erasure::ostreamable<> >, T = boost::type_erasure::_self]’ 01.cpp:11:49: instantiated from ‘display::display(const T&) [with T = char [4]]’ 01.cpp:26:28: instantiated from here ../boost/type_erasure/detail/storage.hpp:24:44: error: ISO C++ forbids initialization in array new
In Christ, Steven Watanabe