IMP  2.0.0
The Integrative Modeling Platform
IMP::kernel::Key< ID, LazyAdd > Class Template Reference

A base class for Keys. More...

#include <IMP/kernel/Key.h>

+ Inheritance diagram for IMP::kernel::Key< ID, LazyAdd >:

Public Member Functions

 Key ()
 make a default key in a well-defined null state
 
 Key (std::string c)
 Generate a key from the given string. More...
 
unsigned int get_index () const
 
const std::string get_string () const
 Turn a key into a pretty string.
 
Key operator+ (int o) const
 
Keyoperator++ ()
 
Keyoperator-- ()
 
void show (std::ostream &out=std::cout) const
 

Static Public Member Functions

static Key< ID, LazyAdd > add_alias (Key< ID, LazyAdd > old_key, std::string new_name)
 Make new_name an alias for old_key. More...
 
static unsigned int add_key (std::string sc)
 
static base::Vector< std::string > get_all_strings ()
 Get a list of all of the keys of this type. More...
 
static bool get_key_exists (std::string sc)
 Return true if there already is a key with that string.
 
static unsigned int get_number_unique ()
 Get the total number of keys of this type. More...
 
static void show_all (std::ostream &out)
 Show all the keys of this type.
 

Detailed Description

template<unsigned int ID, bool LazyAdd>
class IMP::kernel::Key< ID, LazyAdd >

This class does internal caching of the strings to accelerate the name lookup. It is better to create a Key and reuse it rather than recreate it many times from strings.

If you use this with a new type, you must add a new definition of attribute_table_index. Yes, this is an evil hack, but I couldn't get linking to work with static members of the template class.

The keys in IMP maintain a cached mapping between strings and indexes. This mapping is global–that is all IMP Models and Particles in the same program use the same mapping for each type of key. The type of the key is determined by an integer which should be unique for each type. If the integer is not unique, everything works, just more memory is wasted and types are interconvertible.

Keys used for storing attributes in particles should never be statically initialized. While this is annoying, statically initializing them is bad, as unused attribute keys can result in wasted memory in each particle.

If LazyAdd is true, keys created with a new string will be added, otherwise this is an error.

Definition at line 46 of file kernel/Key.h.

Constructor & Destructor Documentation

template<unsigned int ID, bool LazyAdd>
IMP::kernel::Key< ID, LazyAdd >::Key ( std::string  c)
explicit

This operation can be expensive, so please cache the result.

Definition at line 106 of file kernel/Key.h.

Member Function Documentation

template<unsigned int ID, bool LazyAdd>
static Key<ID, LazyAdd> IMP::kernel::Key< ID, LazyAdd >::add_alias ( Key< ID, LazyAdd >  old_key,
std::string  new_name 
)
static

Afterwards

Key<ID>(old_key.get_string()) == Key<ID>(new_name)

Definition at line 154 of file kernel/Key.h.

template<unsigned int ID, bool LazyAdd>
static base::Vector<std::string> IMP::kernel::Key< ID, LazyAdd >::get_all_strings ( )
static

This can be used to check for typos and similar keys.

template<unsigned int ID, bool LazyAdd>
static unsigned int IMP::kernel::Key< ID, LazyAdd >::get_number_unique ( )
static

This is mostly for debugging to make sure that there are no extra keys created.

Definition at line 185 of file kernel/Key.h.

template<unsigned int ID, bool LazyAdd>
Key& IMP::kernel::Key< ID, LazyAdd >::operator++ ( )

Definition at line 192 of file kernel/Key.h.


The documentation for this class was generated from the following file: