boost::fallback_to_default< DefaultT > Struct Template Reference

The fallback_to_default policy results in a default value if the attribute value cannot be extracted. More...

#include <fallback_policy_fwd.hpp>

Public Types
enum	{ guaranteed_result = true }
typedef remove_cv< typename remove_reference< DefaultT > ::type >::type	default_type
	Default value type. More...

Public Member Functions
	fallback_to_default ()
	Default constructor. More...
	fallback_to_default (default_type const &def_val)
	Initializing constructor. More...
template<typename FunT >
bool	apply_default (FunT &fun) const
	The method is called in order to apply a function object to the default value. More...
template<typename FunT >
bool	apply_default (FunT const &fun) const
	The method is called in order to apply a function object to the default value. More...

Static Public Member Functions
static void	on_invalid_type (type_info_wrapper const &)
	The method is called when value extraction failed because the attribute value has different type than requested. More...
static void	on_missing_value ()
	The method is called when value extraction failed because the attribute value was not found. More...

Detailed Description

template<typename DefaultT>
struct boost::fallback_to_default< DefaultT >

The fallback_to_default policy results in a default value if the attribute value cannot be extracted.

Member Typedef Documentation

template<typename DefaultT >

typedef remove_cv< typename remove_reference< DefaultT >::type >::type boost::fallback_to_default< DefaultT >::default_type

Default value type.

Member Enumeration Documentation

template<typename DefaultT >

anonymous enum

Enumerator
guaranteed_result

Constructor & Destructor Documentation

template<typename DefaultT >

boost::fallback_to_default< DefaultT >::fallback_to_default ( )

inline

Default constructor.

template<typename DefaultT >

boost::fallback_to_default< DefaultT >::fallback_to_default ( default_type const &  def_val )

inlineexplicit

Initializing constructor.

Member Function Documentation

template<typename DefaultT >

template<typename FunT >

bool boost::fallback_to_default< DefaultT >::apply_default ( FunT &  fun ) const

inline

The method is called in order to apply a function object to the default value.

template<typename DefaultT >

template<typename FunT >

bool boost::fallback_to_default< DefaultT >::apply_default ( FunT const &  fun ) const

inline

The method is called in order to apply a function object to the default value.

template<typename DefaultT >

static void boost::fallback_to_default< DefaultT >::on_invalid_type ( type_info_wrapper const &  )

inlinestatic

The method is called when value extraction failed because the attribute value has different type than requested.

template<typename DefaultT >

static void boost::fallback_to_default< DefaultT >::on_missing_value ( )

inlinestatic

The method is called when value extraction failed because the attribute value was not found.

---

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

• boost_1_57_0/boost/log/attributes/fallback_policy.hpp