[iterators] Improve indexing of defined terms.

source/iterators.tex

@@ -468,7 +468,7 @@
 resulting in a value of some object type
 \tcode{T},
 called the
-\term{value type}
+\defn{value type}
 of the iterator.
 An output iterator \tcode{i} has a non-empty set of types that are
 \defn{writable} to the iterator;
@@ -477,7 +477,7 @@
 For every iterator type
 \tcode{X},
 there is a corresponding signed integer-like type\iref{iterator.concept.winc} called the
-\term{difference type}
+\defn{difference type}
 of the iterator.
 
 \pnum
@@ -556,15 +556,13 @@
 Just as a regular pointer to an array guarantees that there is a pointer value pointing past the last element
 of the array, so for any iterator type there is an iterator value that points past the last element of a
 corresponding sequence.
-These values are called
-\term{past-the-end}
-values.
+Such a value is called a \defnadj{past-the-end}{value}.
 Values of an iterator
 \tcode{i}
 for which the expression
 \tcode{*i}
 is defined are called
-\term{dereferenceable}.
+\defn{dereferenceable}.
 The library never assumes that past-the-end values are dereferenceable.
 Iterators can also have singular values that are not associated with any
 sequence.
@@ -594,7 +592,7 @@
 
 \pnum
 Most of the library's algorithmic templates that operate on data structures have
-interfaces that use ranges. A \term{range} is an iterator and a \term{sentinel}
+interfaces that use ranges. A \defn{range} is an iterator and a \defn{sentinel}
 that designate the beginning and end of the computation, or an iterator and a
 count that designate the beginning and the number of elements to which the
 computation is to be applied.\footnote{The sentinel denoting the end of a range
@@ -644,9 +642,8 @@
 previously obtained from that iterator.
 
 \pnum
-An
-\term{invalid}
-iterator is an iterator that may be singular.\footnote{This definition applies to pointers, since pointers are iterators.
+An \defnadj{invalid}{iterator}
+is an iterator that may be singular.\footnote{This definition applies to pointers, since pointers are iterators.
 The effect of dereferencing an iterator that has been invalidated
 is undefined.
 }
@@ -1404,7 +1401,7 @@
 
 \pnum
 Let \tcode{i} be an object of type \tcode{I}. When \tcode{i} is in the domain of
-both pre- and post-increment, \tcode{i} is said to be \term{incrementable}.
+both pre- and post-increment, \tcode{i} is said to be \defn{incrementable}.
 \tcode{I} models \tcode{\libconcept{weakly_incrementable}<I>} only if
 \begin{itemize}
 \item The expressions \tcode{++i} and \tcode{i++} have the same domain.
@@ -2590,7 +2587,7 @@
 argument, so that the function can select the most efficient algorithm at compile time.
 To facilitate this, the
 library introduces
-\term{category tag}
+\defn{category tag}
 classes which are used as compile time tags for algorithm selection.
 They are:
 \tcode{output_iterator_tag},