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--- cpp:exception_rethrow [2019/05/06 08:41]
gthanos [Παραλλαγή του παραπάνω παραδείγματος]
+++ cpp:exception_rethrow [2019/05/06 08:41]
gthanos [Διαχείριση εξαίρεσης και παραγωγή νέας εξαίρεσης κατά τη διαχείριση της]
@@ Line 17: / Line 17: @@
   int **raster;
 public:
-  PPMImage(char *filename) {
+  PPMImage(char *filename);
-    string str;
+  ~PPMImage();
-    unsigned char red, green, blue;
+};
-    ifstream in(filename);
-    if(!in.is_open()) {
+PPMImage::PPMImage(char *filename) {
-      std::ios_base::failure fex("File not found!");
+  string str;
-      throw fex;
+  unsigned char red, green, blue;
-    }
+  ifstream in(filename);
-    try {
+  if(!in.is_open()) {
-      in >> str;
+    std::ios_base::failure fex("File not found!");
-      in >> str;
+    throw fex;
-      width = atoi(str.c_str());
+  }
-      in >> str;
+  try {
-      height = atoi(str.c_str());
+    in >> str;
-      in >> str;
+    in >> str;
-      colordepth = atoi(str.c_str());
+    width = atoi(str.c_str());
-      raster = new int*[height];
+    in >> str;
-      for(int row=0; row<height; row++)
+    height = atoi(str.c_str());
-        raster[row] = new int[width];
+    in >> str;
-      for(int row=0; row<height; row++) {
+    colordepth = atoi(str.c_str());
-        for(int col=0; col<width; col++) {
+    raster = new int*[height];
-          cin >> str;
+    for(int row=0; row<height; row++)
-          red = (unsigned char) atoi(str.c_str());
+      raster[row] = new int[width];
-          cin >> str;
+    for(int row=0; row<height; row++) {
-          green = (unsigned char) atoi(str.c_str());
+      for(int col=0; col<width; col++) {
-          cin >> str;
+        cin >> str;
-          blue = (unsigned char) atoi(str.c_str());
+        red = (unsigned char) atoi(str.c_str());
-          raster[row][col] = 0;
+        cin >> str;
-          raster[row][col] = (red << 16) | (green << 8) | blue;
+        green = (unsigned char) atoi(str.c_str());
-        }
+        cin >> str;
+        blue = (unsigned char) atoi(str.c_str());
+        raster[row][col] = 0;
+        raster[row][col] = (red << 16) | (green << 8) | blue;
       }
-    }
-    catch(std::bad_alloc &ex) {
-      cerr << "std::bad_alloc occured!\n";
-      in.close();
-      throw ex;
     }
   }
+  catch(std::bad_alloc &ex) {
-  ~PPMImage() {
+    cerr << "std::bad_alloc occured!\n";
-    for(int row=0; row<height; row++)
+    in.close();
-      delete raster[row];
+    throw ex;
-    delete raster;
   }
+}
-  int **getRaster() { return raster; }
+PPMImage::~PPMImage() {
+  if(raster == nullptr)
-};
+    return;
+  for(int row=0; row<height; row++)
+    delete raster[row];
+  delete raster;
+  raster = nullptr;
+}
 int main(int argc, char *argv[]) {
@@ Line 72: / Line 75: @@
   }
   catch(ios_base::failure &fex) {
-    cerr << "File '" << argv[0] << "' was not found!\n";
+    cerr << "File '" << argv[1] << "' was not found!\n";
   }
   catch(bad_alloc &ex) {
     cerr << "Memory allocation failure!\n";
-    if (imgptr!=nullptr) {
+    if (imgptr!=nullptr)
       cerr << "imgptr != nullptr\n";
-      if(imgptr->getRaster() != nullptr) {
+    else
-        cerr << "imgptr->getRaster() != nullptr\n";
-        delete imgptr->getRaster();
-      }
-      else {
-        cerr << "imgptr->getRaster() == nullptr\n";
-      }
-      delete imgptr;
-    }
-    else {
       cerr << "imgptr == nullptr\n";
-    }
   }
   delete imgptr;

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