NAME

       kdb::Context - Provides a context for configuration.

SYNOPSIS

       #include <kdbcontext.hpp>

       Inherits kdb::Subject.

       Inherited by kdb::ThreadContext.

   Public Member Functions
       std::string operator[] (std::string const &layer) const
           Lookup value for a current active layer.
       size_t size () const
       void attachByName (std::string const &key_name, ValueObserver &observer)
           Attach observer using to all events given by its specification (name)
       std::string evaluate (std::string const &key_name) const
           Evaluate a specification (name) and return a key name under current context.
       std::string evaluate (std::string const &key_name, std::function< bool(std::string const
           &, std::string &, bool in_group)> const &on_layer) const
           Evaluate specification with this context.
       template<typename T , typename... Args> std::shared_ptr< Layer > activate (Args &&...args)
           Globally activate the layer.

Detailed Description

       Provides a context for configuration.

       Is a subject for observers.

       Holds currently active layers and allows global/scoped activation of layers.

Member Function Documentation

   template<typename T , typename... Args> std::shared_ptr<Layer> kdb::Context::activate (Args
       &&... args) [inline]
       Globally activate the layer.

       Template Parameters:
           T the layer to activate
           Args the types for the arguments to pass to layer construction

       Parameters:
           args the arguments to pass to layer construction

   void kdb::Context::attachByName (std::string const & key_name, ValueObserver & observer)
       [inline]
       Attach observer using to all events given by its specification (name)

       Parameters:
           key_name the name with placeholders to be used for attaching
           observer the observer to attach to

   std::string kdb::Context::evaluate (std::string const & key_name) const [inline]
       Evaluate a specification (name) and return a key name under current context.

       Parameters:
           key_name the name with placeholders to be evaluated

   std::string kdb::Context::evaluate (std::string const & key_name, std::function<
       bool(std::string const &, std::string &, bool in_group)> const & on_layer) const [inline]
       Evaluate specification with this context.

       Parameters:
           key_name the keyname with placeholders to evaluate
           on_layer the function to be called for every placeholder found

       on_layer is called for every layer in the
           specification.

       Returns:
           the evaluated string

   std::string kdb::Context::operator[] (std::string const & layer) const [inline]
       Lookup value for a current active layer.

       Parameters:
           layer the name of the requested layer

       Returns:
           the layer

   size_t kdb::Context::size () const [inline]
       Returns:
           size of all current layers (to be used with operator[])

Author

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