RAII: PB_LINE_IT::get_line(): was leaked inside POLY_BLOCK::fill()

ccstruct/ocrblock.cpp

@@ -18,6 +18,7 @@
  **********************************************************************/
 
 #include <stdlib.h>
+#include <memory> // std::unique_ptr
 #include "blckerr.h"
 #include "ocrblock.h"
 #include "stepblob.h"
@@ -380,9 +381,8 @@ void BLOCK::compute_row_margins() {
     TBOX row_box = row->bounding_box();
     int left_y = row->base_line(row_box.left()) + row->x_height();
     int left_margin;
-    ICOORDELT_LIST *segments = lines.get_line(left_y);
-    LeftMargin(segments, row_box.left(), &left_margin);
-    delete segments;
+    const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments_left(lines.get_line(left_y));
+    LeftMargin(segments_left.get(), row_box.left(), &left_margin);
 
     if (row_box.top() >= drop_cap_bottom) {
       int drop_cap_distance = row_box.left() - row->space() - drop_cap_right;
@@ -394,9 +394,8 @@ void BLOCK::compute_row_margins() {
 
     int right_y = row->base_line(row_box.right()) + row->x_height();
     int right_margin;
-    segments = lines.get_line(right_y);
-    RightMargin(segments, row_box.right(), &right_margin);
-    delete segments;
+    const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments_right(lines.get_line(right_y));
+    RightMargin(segments_right.get(), row_box.right(), &right_margin);
     row->set_lmargin(left_margin);
     row->set_rmargin(right_margin);
   }

ccstruct/pdblock.cpp

@@ -18,6 +18,7 @@
  **********************************************************************/
 
 #include          <stdlib.h>
+#include          <memory> // std::unique_ptr
 #include          "allheaders.h"
 #include          "blckerr.h"
 #include          "pdblock.h"
@@ -140,9 +141,9 @@ Pix* PDBLK::render_mask(const FCOORD& rerotation, TBOX* mask_box) {
     // rasterized interior. (Runs of interior pixels on a line.)
     PB_LINE_IT *lines = new PB_LINE_IT(&image_block);
     for (int y = box.bottom(); y < box.top(); ++y) {
-      ICOORDELT_LIST* segments = lines->get_line(y);
+      const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments(lines->get_line(y));
       if (!segments->empty()) {
-        ICOORDELT_IT s_it(segments);
+        ICOORDELT_IT s_it(segments.get());
         // Each element of segments is a start x and x size of the
         // run of interior pixels.
         for (s_it.mark_cycle_pt(); !s_it.cycled_list(); s_it.forward()) {
@@ -154,7 +155,6 @@ Pix* PDBLK::render_mask(const FCOORD& rerotation, TBOX* mask_box) {
                       xext, 1, PIX_SET, NULL, 0, 0);
         }
       }
-      delete segments;
     }
     delete lines;
   } else {

ccstruct/polyblk.cpp

@@ -20,6 +20,7 @@
 #include <ctype.h>
 #include <math.h>
 #include <stdio.h>
+#include <memory> // std::unique_ptr
 #include "elst.h"
 #include "polyblk.h"
 
@@ -273,7 +274,6 @@ void POLY_BLOCK::fill(ScrollView* window, ScrollView::Color colour) {
   inT16 y;
   inT16 width;
   PB_LINE_IT *lines;
-  ICOORDELT_LIST *segments;
   ICOORDELT_IT s_it;
 
   lines = new PB_LINE_IT (this);
@@ -281,9 +281,9 @@ void POLY_BLOCK::fill(ScrollView* window, ScrollView::Color colour) {
 
   for (y = this->bounding_box ()->bottom ();
   y <= this->bounding_box ()->top (); y++) {
-    segments = lines->get_line (y);
+    const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments(lines->get_line (y));
     if (!segments->empty ()) {
-      s_it.set_to_list (segments);
+      s_it.set_to_list (segments.get());
       for (s_it.mark_cycle_pt (); !s_it.cycled_list (); s_it.forward ()) {
         // Note different use of ICOORDELT, x coord is x coord of pixel
         // at the start of line segment, y coord is length of line segment

textord/scanedg.cpp

@@ -19,6 +19,8 @@
 
 #include "scanedg.h"
 
+#include <memory> // std::unique_ptr
+
 #include "allheaders.h"
 #include "edgloop.h"
 
@@ -93,7 +95,6 @@ void make_margins(                         //get a line
                   inT16 y                  //line coord
                  ) {
   PB_LINE_IT *lines;
-  ICOORDELT_LIST *segments;      //bits of a line
   ICOORDELT_IT seg_it;
   inT32 start;                   //of segment
   inT16 xext;                    //of segment
@@ -101,9 +102,9 @@ void make_margins(                         //get a line
 
   if (block->poly_block () != NULL) {
     lines = new PB_LINE_IT (block->poly_block ());
-    segments = lines->get_line (y);
+    const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments(lines->get_line (y));
     if (!segments->empty ()) {
-      seg_it.set_to_list (segments);
+      seg_it.set_to_list (segments.get());
       seg_it.mark_cycle_pt ();
       start = seg_it.data ()->x ();
       xext = seg_it.data ()->y ();
@@ -122,7 +123,6 @@ void make_margins(                         //get a line
       for (xindex = left; xindex < right; xindex++)
         pixels[xindex - left] = margin;
     }
-    delete segments;
     delete lines;
   }
   else {