CXXR::ElementTraits::NAFunc< T > Struct Template Reference

Function object to generate 'not available' value. More...

#include <ElementTraits.hpp>

List of all members.

Public Member Functions
const T &	operator() () const
	Value to be used if 'not available'.

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Detailed Description

template<typename T>
struct CXXR::ElementTraits::NAFunc< T >

Function object to generate 'not available' value.

Normally this will be accessed via the NA() function template declared at CXXR namespace level.

Template Parameters:

T	A type capable of being used as the element type of an R data vector.

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Member Function Documentation

template<typename T >

const T& CXXR::ElementTraits::NAFunc< T >::operator()

(

)

const

Value to be used if 'not available'.

Returns:

The value of type T to be used if the actual value is not available. This for example is the value that will be used if an element of a vector of T is accessed in R using a NA index.

Note:

For some types, e.g. Rbyte, the value returned is not distinct from ordinary values of the type. See hasDistinctNA().

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

• ElementTraits.hpp ($Id: ElementTraits.hpp 1375 2013-04-15 17:16:50Z arr $)