Import Geant4 11.0.0.beta source tree

source/externals/g4tools/include/tools/realloc

@@ -0,0 +1,44 @@
+#ifndef tools_realloc
+#define tools_realloc
+
+#include <cstring> //memcpy
+
+namespace tools {
+
+template <class T>
+inline bool realloc(T*& a_pointer,size_t a_new_size,size_t a_old_size,bool a_init = false) {
+  if(!a_new_size) {
+    delete [] a_pointer;
+    a_pointer = 0;
+    return true;
+  }
+  if(!a_pointer) {
+    a_pointer = new T[a_new_size];
+    if(!a_pointer) return false;
+    return true;
+  }
+  if(a_old_size==a_new_size) return true;
+  T* pointer = new T[a_new_size];
+  if(!pointer) {
+    delete [] a_pointer;
+    a_pointer = 0;
+    return false;
+  }
+  if(a_new_size>a_old_size) {
+    ::memcpy(pointer,a_pointer,a_old_size*sizeof(T));
+    if(a_init){
+      size_t num = a_new_size-a_old_size;
+      T* pos = pointer+a_old_size;
+      for(size_t i=0;i<num;i++,pos++) *pos = T();
+    }
+  } else {
+    ::memcpy(pointer,a_pointer,a_new_size*sizeof(T));
+  }
+  delete [] a_pointer;
+  a_pointer = pointer;
+  return true;
+}
+
+}
+
+#endif