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Diffstat (limited to 'cutl/container/any.hxx')
-rw-r--r-- | cutl/container/any.hxx | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/cutl/container/any.hxx b/cutl/container/any.hxx new file mode 100644 index 0000000..0c89a38 --- /dev/null +++ b/cutl/container/any.hxx @@ -0,0 +1,133 @@ +// file : cutl/container/any.hxx +// author : Boris Kolpackov <boris@codesynthesis.com> +// copyright : Copyright (c) 2009 Code Synthesis Tools CC +// license : MIT; see accompanying LICENSE file + +#ifndef CUTL_CONTAINER_ANY_HXX +#define CUTL_CONTAINER_ANY_HXX + +#include <memory> // std::auto_ptr +#include <typeinfo> // std::type_info + +namespace cutl +{ + namespace container + { + class any + { + public: + struct typing {}; + + public: + template <typename X> + any (X const& x) + : holder_ (new holder_impl<X> (x)) + { + } + + any (any const& x) + : holder_ (x.holder_->clone ()) + { + } + + template <typename X> + any& + operator= (X const& x) + { + holder_.reset (new holder_impl<X> (x)); + return *this; + } + + any& + operator= (any const& x) + { + holder_.reset (x.holder_->clone ()); + return *this; + } + + public: + template <typename X> + X& + value () + { + if (holder_impl<X>* p = dynamic_cast<holder_impl<X>*> (holder_.get ())) + return p->value (); + else + throw typing (); + } + + template <typename X> + X const& + value () const + { + if (holder_impl<X>* p = dynamic_cast<holder_impl<X>*> (holder_.get ())) + return p->value (); + else + throw typing (); + } + + public: + std::type_info const& + type_info () const + { + return holder_->type_info (); + } + + private: + class holder + { + public: + virtual + ~holder () {} + + virtual holder* + clone () const = 0; + + virtual std::type_info& + type_info () const = 0; + }; + + template <typename X> + class holder_impl: public holder + { + public: + holder_impl (X const& x) + : x_ (x) + { + } + + virtual holder_impl* + clone () const + { + return new holder_impl (x_); + } + + virtual std::type_info& + type_info () const + { + return typeid (x_); + } + + X const& + value () const + { + return x_; + } + + X& + value () + { + return x_; + } + + private: + X x_; + }; + + private: + std::auto_ptr<holder> holder_; + }; + } +} + +#endif // CUTL_CONTAINER_ANY_HXX |