[re.iter] Clean up exposition-only member names for regex iterators

This PR renames exposition-only members for `regex_iterator` and
`regex_token_iterator`, and properly uses italic format for them.

In [re.regiter] `regex_iterator`:
- `begin` -> _`begin_`_
- `end` -> _`end_`_
- `pregex` -> _`pregex_`_
- `flags` -> _`flags_`_
- `match` -> _`match_`_

In [re.tokiter] `regex_token_iterator`:
- `position_iterator` -> _`position-iterator`_
- `position` -> _`position_`_
- `result` -> _`result_`_
- `suffix` -> _`suffix_`_
- `N` -> _`n_`_
- `subs` -> _`subs_`_

Author: frederick-vs-ja

source/text.tex

@@ -12331,19 +12331,19 @@
     regex_iterator operator++(int) = default;
 
   private:
-    BidirectionalIterator                begin;                 // \expos
-    BidirectionalIterator                end;                   // \expos
-    const regex_type*                    pregex;                // \expos
-    regex_constants::match_flag_type     flags;                 // \expos
-    match_results<BidirectionalIterator> match;                 // \expos
+    BidirectionalIterator                @\exposid{begin_}@;                // \expos
+    BidirectionalIterator                @\exposid{end_}@;                  // \expos
+    const regex_type*                    @\exposid{pregex_}@;               // \expos
+    regex_constants::match_flag_type     @\exposid{flags_}@;                // \expos
+    match_results<BidirectionalIterator> @\exposid{match_}@;                // \expos
   };
 }
 \end{codeblock}
 
 \pnum
 An object of type \tcode{regex_iterator} that is not an end-of-sequence iterator
-holds a \textit{zero-length match} if \tcode{match[0].matched == true} and
-\tcode{match[0].first == match[0].second}.
+holds a \textit{zero-length match} if \tcode{\exposid{match_}[0].matched == true} and
+\tcode{\exposid{match_}[0].first == \exposid{match_}[0].second}.
 \begin{note}
 For
 example, this can occur when the part of the regular expression that
@@ -12374,10 +12374,10 @@
 \begin{itemdescr}
 \pnum
 \effects
-Initializes \tcode{begin} and \tcode{end} to
+Initializes \exposid{begin_} and \exposid{end_} to
 \tcode{a} and \tcode{b}, respectively, sets
-\tcode{pregex} to \tcode{addressof(re)}, sets \tcode{flags} to
-\tcode{m}, then calls \tcode{regex_search(begin, end, match, *pregex, flags)}. If this
+\exposid{pregex_} to \tcode{addressof(re)}, sets \exposid{flags_} to
+\tcode{m}, then calls \tcode{regex_search(\exposid{begin_}, \exposid{end_}, \exposid{match_}, *\exposid{pregex_}, \exposid{flags_})}. If this
 call returns \tcode{false} the constructor sets \tcode{*this} to the end-of-sequence
 iterator.
 \end{itemdescr}
@@ -12395,11 +12395,11 @@
 \tcode{true} if \tcode{*this} and \tcode{right} are both end-of-sequence
 iterators or if the following conditions all hold:
 \begin{itemize}
-\item \tcode{begin == right.begin},
-\item \tcode{end == right.end},
-\item \tcode{pregex == right.pregex},
-\item \tcode{flags == right.flags}, and
-\item \tcode{match[0] == right.match[0]};
+\item \tcode{\exposid{begin_} == right.\exposid{begin_}},
+\item \tcode{\exposid{end_} == right.\exposid{end_}},
+\item \tcode{\exposid{pregex_} == right.\exposid{pregex_}},
+\item \tcode{\exposid{flags_} == right.\exposid{flags_}}, and
+\item \tcode{\exposid{match_}[0] == right.\exposid{match_}[0]};
 \end{itemize}
 otherwise \tcode{false}.
 \end{itemdescr}
@@ -12414,7 +12414,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{match}.
+\exposid{match_}.
 \end{itemdescr}
 
 \indexlibrarymember{operator->}{regex_iterator}%
@@ -12425,7 +12425,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{addressof(match)}.
+\tcode{addressof(\exposid{match_})}.
 \end{itemdescr}
 
 \rSec4[re.regiter.incr]{Increment}
@@ -12440,19 +12440,19 @@
 \pnum
 \effects
 Constructs a local variable \tcode{start} of type \tcode{BidirectionalIterator} and
-initializes it with the value of \tcode{match[0].second}.
+initializes it with the value of \tcode{\exposid{match_}[0].second}.
 
 \pnum
-If the iterator holds a zero-length match and \tcode{start == end} the operator
+If the iterator holds a zero-length match and \tcode{start == \exposid{end_}} the operator
 sets \tcode{*this} to the end-of-sequence iterator and returns \tcode{*this}.
 
 \pnum
 \indexlibraryglobal{match_not_null}%
 \indexlibraryglobal{match_continuous}%
 Otherwise, if the iterator holds a zero-length match, the operator calls:
 \begin{codeblock}
-regex_search(start, end, match, *pregex,
-             flags | regex_constants::match_not_null | regex_constants::match_continuous)
+regex_search(start, \exposid{end_}, \exposid{match_}, *\exposid{pregex_},
+             \exposid{flags_} | regex_constants::match_not_null | regex_constants::match_continuous)
 \end{codeblock}
 If the call returns \tcode{true} the operator
 returns \tcode{*this}. Otherwise the operator increments \tcode{start} and continues as if
@@ -12461,22 +12461,22 @@
 \pnum
 \indexlibraryglobal{match_prev_avail}%
 If the most recent match was not a zero-length match, the operator sets
-\tcode{flags} to \tcode{flags | regex_constants::match_prev_avail} and
-calls \tcode{regex_search(start, end, match, *pregex, flags)}. If the call returns
+\exposid{flags_} to \tcode{\exposid{flags_} | regex_constants::match_prev_avail} and
+calls \tcode{regex_search(start, \exposid{end_}, \exposid{match_}, *\exposid{pregex_}, \exposid{flags_})}. If the call returns
 \tcode{false} the iterator sets \tcode{*this} to the end-of-sequence iterator. The
 iterator then returns \tcode{*this}.
 
 \pnum
 In all cases in which the call to \tcode{regex_search} returns \tcode{true},
-\tcode{match.prefix().first} shall be equal to the previous value of
-\tcode{match[0].second}, and for each index \tcode{i} in the half-open range
-\range{0}{match.size()} for which \tcode{match[i].matched} is \tcode{true},
-\tcode{match.position(i)}
-shall return \tcode{distance(begin, match[i].\brk{}first)}.
+\tcode{\exposid{match_}.prefix().first} shall be equal to the previous value of
+\tcode{\exposid{match_}[0].second}, and for each index \tcode{i} in the half-open range
+\range{0}{\exposid{match_}.size()} for which \tcode{\exposid{match_}[i].matched} is \tcode{true},
+\tcode{\exposid{match_}.position(i)}
+shall return \tcode{distance(\exopsid{begin_},\brk{} \exposid{match_}[i].first)}.
 
 \pnum
 \begin{note}
-This means that \tcode{match.position(i)} gives the
+This means that \tcode{\exposid{match_}.position(i)} gives the
 offset from the beginning of the target sequence, which is often not
 the same as the offset from the sequence passed in the call
 to \tcode{regex_search}.
@@ -12518,16 +12518,16 @@
 \pnum
 \indexlibraryglobal{match_results}%
 After it is constructed, the iterator finds and stores a value
-\tcode{regex_iterator<BidirectionalIterator> position}
-and sets the internal count \tcode{N} to zero. It also maintains a sequence
-\tcode{subs} which contains a list of the sub-expressions which will be
+\tcode{regex_iterator<BidirectionalIterator> \exposid{position_}}
+and sets the internal count \exposid{n_} to zero. It also maintains a sequence
+\exposid{subs_} which contains a list of the sub-expressions which will be
 enumerated. Every time \tcode{operator++} is used
-the count \tcode{N} is incremented; if \tcode{N} exceeds or equals \tcode{subs.size()},
-then the iterator increments member \tcode{position}
-and sets count \tcode{N} to zero.
+the count \exposid{n_} is incremented; if \exposid{n_} exceeds or equals \tcode{\exposid{subs_}.size()},
+then the iterator increments member \exposid{position_}
+and sets count \exposid{n_} to zero.
 
 \pnum
-If the end of sequence is reached (\tcode{position} is equal to the end of
+If the end of sequence is reached (\exposid{position_} is equal to the end of
 sequence iterator), the iterator becomes equal to the end-of-sequence
 iterator value, unless the sub-expression being enumerated has index $-1$,
 in which case the iterator enumerates one last sub-expression that contains
@@ -12622,13 +12622,13 @@
     regex_token_iterator operator++(int) = default;
 
   private:
-    using position_iterator =
+    using @\exposid{position-iterator}@ =
       regex_iterator<BidirectionalIterator, charT, traits>;     // \expos
-    position_iterator position;                                 // \expos
-    const value_type* result;                                   // \expos
-    value_type suffix;                                          // \expos
-    size_t N;                                                   // \expos
-    vector<int> subs;                                           // \expos
+    @\exposid{position-iterator}@ @\exposid{position_}@;                                // \expos
+    const value_type* @\exposid{result_}@;                                  // \expos
+    value_type @\exposid{suffix_}@;                                         // \expos
+    size_t @\exposid{n_}@;                                                  // \expos
+    vector<int> @\exposid{subs_}@;                                          // \expos
   };
 }
 \end{codeblock}
@@ -12637,23 +12637,23 @@
 A \textit{suffix iterator} is a \tcode{regex_token_iterator} object
 that points to a final sequence of characters at
 the end of the target sequence. In a suffix iterator the
-member \tcode{result} holds a pointer to the data
-member \tcode{suffix}, the value of the member \tcode{suffix.matched}
-is \tcode{true}, \tcode{suffix.first} points to the beginning of the
-final sequence, and \tcode{suffix.second} points to the end of the
+member \exposid{result_} holds a pointer to the data
+member \exposid{suffix_}, the value of the member \tcode{\exposid{suffix_}.matched}
+is \tcode{true}, \tcode{\exposid{suffix_}.first} points to the beginning of the
+final sequence, and \tcode{\exposid{suffix_}.second} points to the end of the
 final sequence.
 
 \pnum
 \begin{note}
 For a suffix iterator, data
-member \tcode{suffix.first} is the same as the end of the last match
-found, and \tcode{suffix\brk.second} is the same as the end of the target
+member \tcode{\exposid{suffix_}.first} is the same as the end of the last match
+found, and \tcode{\exposid{suffix_}\brk.second} is the same as the end of the target
 sequence.
 \end{note}
 
 \pnum
-The \textit{current match} is \tcode{(*position).prefix()} if \tcode{subs[N] == -1}, or
-\tcode{(*position)[subs[N]]} for any other value of \tcode{subs[N]}.
+The \textit{current match} is \tcode{(*\exposid{position_}).prefix()} if \tcode{\exposid{subs_}[\exposid{n_}] == -1}, or
+\tcode{(*\exposid{position_})[\exposid{subs_}[\exposid{n_}]]} for any other value of \tcode{\exposid{subs_}[\exposid{n_}]}.
 
 \rSec4[re.tokiter.cnstr]{Constructors}
 
@@ -12699,19 +12699,19 @@
 
 \pnum
 \effects
-The first constructor initializes the member \tcode{subs} to hold the single
+The first constructor initializes the member \exposid{subs_} to hold the single
 value \tcode{submatch}.
 The second, third, and fourth constructors
-initialize the member \tcode{subs} to hold a copy of the sequence of integer values
+initialize the member \exposid{subs_} to hold a copy of the sequence of integer values
 pointed to by the iterator range
 \range{begin(submatches)}{end(submatches)}.
 
 \pnum
-Each constructor then sets \tcode{N} to 0, and \tcode{position} to
-\tcode{position_iterator(a, b, re, m)}. If \tcode{position} is not an
-end-of-sequence iterator the constructor sets \tcode{result} to the
+Each constructor then sets \exposid{n_} to 0, and \exposid{position_} to
+\tcode{\exposid{position-iterator}(a, b, re, m)}. If \exposid{position_} is not an
+end-of-sequence iterator the constructor sets \exposid{result_} to the
 address of the current match. Otherwise if any of the values stored
-in \tcode{subs} is equal to $-1$ the constructor sets \tcode{*this} to a suffix
+in \exposid{subs_} is equal to $-1$ the constructor sets \tcode{*this} to a suffix
 iterator that points to the range \range{a}{b}, otherwise the constructor
 sets \tcode{*this} to an end-of-sequence iterator.
 \end{itemdescr}
@@ -12727,10 +12727,10 @@
 \pnum
 \returns
 \tcode{true} if \tcode{*this} and \tcode{right} are both end-of-sequence iterators,
-or if \tcode{*this} and \tcode{right} are both suffix iterators and \tcode{suffix == right.suffix};
+or if \tcode{*this} and \tcode{right} are both suffix iterators and \tcode{\exposid{suffix_} == right.\exposid{suffix_}};
 otherwise returns \tcode{false} if \tcode{*this} or \tcode{right} is an end-of-sequence
-iterator or a suffix iterator. Otherwise returns \tcode{true} if \tcode{position == right.position},
-\tcode{N == right.N}, and \tcode{subs == right.subs}. Otherwise returns \tcode{false}.
+iterator or a suffix iterator. Otherwise returns \tcode{true} if \tcode{\exposid{position_} == right.\exposid{position_}},
+\tcode{\exposid{n_} == right.\exposid{n_}}, and \tcode{\exposid{subs_} == right.\exposid{subs_}}. Otherwise returns \tcode{false}.
 \end{itemdescr}
 
 \rSec4[re.tokiter.deref]{Indirection}
@@ -12743,7 +12743,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{*result}.
+\tcode{*\exposid{result_}}.
 \end{itemdescr}
 
 \indexlibrarymember{operator->}{regex_token_iterator}%
@@ -12754,7 +12754,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{result}.
+\exposid{result_}.
 \end{itemdescr}
 
 
@@ -12769,25 +12769,25 @@
 \pnum
 \effects
 Constructs a local variable \tcode{prev} of
-type \tcode{position_iterator}, initialized with the value
-of \tcode{position}.
+type \exposid{position-iterator}, initialized with the value
+of \exposid{position_}.
 
 \pnum
 If \tcode{*this} is a suffix iterator, sets \tcode{*this} to an
 end-of-sequence iterator.
 
 \pnum
-Otherwise, if \tcode{N + 1 < subs.size()}, increments \tcode{N} and
-sets \tcode{result} to the address of the current match.
+Otherwise, if \tcode{\exposid{n_} + 1 < \exposid{subs_}.size()}, increments \exposid{n_} and
+sets \exposid{result_} to the address of the current match.
 
 \pnum
-Otherwise, sets \tcode{N} to 0 and
-increments \tcode{position}. If \tcode{position} is not an
-end-of-sequence iterator the operator sets \tcode{result} to the
+Otherwise, sets \exposid{n_} to 0 and
+increments \exposid{position_}. If \exposid{position_} is not an
+end-of-sequence iterator the operator sets \exposid{result_} to the
 address of the current match.
 
 \pnum
-Otherwise, if any of the values stored in \tcode{subs} is equal to $-1$ and
+Otherwise, if any of the values stored in \exposid{subs_} is equal to $-1$ and
 \tcode{prev->suffix().length()} is not 0 the operator sets \tcode{*this} to a
 suffix iterator that points to the range \range{prev->suffix().first}{prev->suffix().second}.