regina::EnableIf< condition, T, defaultValue > Struct Template Reference

A struct that holds either a single value of type T or nothing at all, depending on whether the given compile-time condition holds. More...

#include <utilities/typeutils.h>

Public Attributes
T	value { defaultValue }
	The data member to store if condition is true. More...

Detailed Description

template<bool condition, typename T, T defaultValue>
struct regina::EnableIf< condition, T, defaultValue >

A struct that holds either a single value of type T or nothing at all, depending on whether the given compile-time condition holds.

If condition is true, then this struct holds a single data member value of type T, which will be initialised on construction with defaultValue.

The advantage to using this class over std::conditional is that it supports assigning a default value on construction.

Template Parameters

condition	true if the data member should be included, or false if this struct should be empty.
T	the data type to store.
defaultValue	the value to assign the data member upon construction.

Member Data Documentation

value

template<bool condition, typename T , T defaultValue>

T regina::EnableIf< condition, T, defaultValue >::value { defaultValue }

The data member to store if condition is true.

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

• utilities/typeutils.h