configflags.hpp File Reference

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Description

Under some circumstances it is necessary to assemble functionality out of elementary building blocks.

Especially, this assembly can be expressed as template specialisations directed by a configuration type. Thus, the purpose of this header is to encode flag-like configurations as distinct types, which can be used to select such specialisations. Each possible configuration can be encoded as a list of flags, which allows to generate, filter and process those configurations. The final goal is to automatically generate a factory which is able to deliver objects configured according to the situation encoded in the flags.

Note

currently there is an inherent limitation to configurations defined by a maximum of 5 independent flags. While it is easy to increase this limit, you should consider that the final goal is to generate template instantiations, which would lead to more and more code bloat with growing number of possible combinations.

See also

steam::engine::config::Strategy usage example

steam::engine::config::ConfigSelector

typelist.hpp

Definition in file configflags.hpp.

#include "lib/meta/typelist.hpp"

Classes
struct	BuildConfigFromFlags< FLAGS, CONF >
	build a configuration type from a list-of-flags More...
struct	BuildConfigFromFlags< Node< Flag< Fl >, FLAGS >, CONF >
struct	Config< f1, f2, f3, f4, f5 >
	< distinct type representing a configuration More...
struct	ConfigSetFlag< Fl, CONF >
struct	ConfigSetFlag< Fl, Config< f1, f2, f3, f4, IGN > >
	set (prepend) the Flag to the given config More...
struct	DefineConfigByFlags< FLAGS >
	create a configuration type for the given list-of-flags More...
struct	Flag< bit >
struct	Flag< 0 >
struct	FlagInfo< FLAGS >
	Helper for calculating values and for invoking runtime code based on a given FlagTuple. More...
struct	FlagInfo< Node< CONF, TAIL > >
struct	FlagInfo< Node< Flag< ff >, FLAGS > >
struct	FlagInfo< NullType >
struct	Flags< f1, f2, f3, f4, f5 >
struct	maxC< ii, jj >
	helper comparing enum values and flags More...

Variables
const size_t	CONFIG_FLAGS_MAX = 5

Namespaces
	lib
	Implementation namespace for support and library code.