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std::experimental::ranges::tag:: in, in1, in2, out, out1, out2, fun, min, max, begin, end

From cppreference.net
struct in { /* implementation-defined */ } ;

struct in1 { /* implementation-defined */ } ;
struct in2 { /* implementation-defined */ } ;
struct out { /* implementation-defined */ } ;
struct out1 { /* implementation-defined */ } ;
struct out2 { /* implementation-defined */ } ;
struct fun { /* implementation-defined */ } ;
struct min { /* implementation-defined */ } ;
struct max { /* implementation-defined */ } ;
struct begin { /* implementation-defined */ } ;

struct end { /* implementation-defined */ } ;
(ranges TS)

These classes are TagSpecifier s for use with ranges::tagged .

The name of a specifier is also the element name it corresponds to. For instance, ranges:: tagged < std:: pair < int , int > , tag :: min , tag :: max > provides a set of named accessors named min and a set of named accessors named max .