boost::fallback_to_none Struct Reference

The fallback_to_none policy results in returning an empty value reference if the attribute value cannot be extracted. More...

#include <fallback_policy.hpp>

Public Types
enum	{ guaranteed_result = false }

Static Public Member Functions
template<typename FunT >
static bool	apply_default (FunT &)
	The method is called in order to apply a function object to the default value. More...
template<typename FunT >
static bool	apply_default (FunT const &)
	The method is called in order to apply a function object to the default value. More...
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

The fallback_to_none policy results in returning an empty value reference if the attribute value cannot be extracted.

Member Enumeration Documentation

anonymous enum

Enumerator
guaranteed_result

Member Function Documentation

template<typename FunT >

static bool boost::fallback_to_none::apply_default ( FunT &  )

inlinestatic

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

template<typename FunT >

static bool boost::fallback_to_none::apply_default ( FunT const &  )

inlinestatic

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

static void boost::fallback_to_none::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.

static void boost::fallback_to_none::on_missing_value ( )

inlinestatic

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

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

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