#include <tuple.h>

详细描述

template<typename SEARCHTYPE, typename TUPLETYPE>
struct maxon::FindUniqueTupleIndex< SEARCHTYPE, TUPLETYPE >

A class that can be used to find the index of a unique element type in a tuple. If no match was found or the type was not unique, a negative value is used. Unique means there is exactly one element with the given type. Works at compile time.

范例：

static const Int index = FindTupleIndex<String, Tuple<Int, String, String>>::value; // index is negative, because String occurs twice static_assert (index < 0, "type not found" );