isPermutationType::with - HaxyM/crap GitHub Wiki

crap :: isPermutationType

Defined in "crap/algorithm.d/ispermutationtype.h".
Defined in "crap/algorithm".

template <template <class, class> class Operator, class ... Types1> struct isPermutationType
{
 /*...*/
 template <class ... Types2> struct with;
 /*...*/
};

Nested in isPermutationType (for details see isPermutationType). Checks if passed Types1... (by isPartitionType nesting type - for details see isPermutationType - Template parameters section) are (according to comparing for equality Operator passed by isPartitionType nesting type - for detials see isPermutationType - Template parameters section) premutation of other Types2....

Template parameters

Types2... - types to be checked if are forming a permutation of Types1... (for details see isPermutationType - Template parameters section) with equality defined by Operator (for details see isPermutationType - Template parameters section) binary comparator.

Layout

Memeber constants

value - true if Types1... is permutation of Types2... where equality is defined by Operator (see Operator in isPermutationType - Template parameters section) binary comparator. False if not.

Member types

value_type - type of field value. May not be bool but should be castable to this type.

Member functions

constexpr operator value_type () const noexcept - casts whole object to its value_type returning value.

Usage example

#include "crap/algorithm.d/ispermutationtype.h"

template <class ... Types> class myAwsomeVariant
{
 /*...*/
 template <class ... OtherTypes,
 std :: enable_if_t<crap :: isPermutationType <std :: is_same, Types...> :: template with<OtherTypes...>(), void*> = nullptr>
 myAwsomeVariant(const myAwsomeVariant<OtherTypes...>&);
 //Allow copying from other variants if their types form permutation of this one.
 /*...*/
};