bring sepofra over from ~/hack/

1 files changed, 45 insertions, 0 deletions

diff --git a/tools/bad_thing.h b/tools/bad_thing.h
new file mode 100644
index 0000000..ee988dc
--- /dev/null
+++ b/tools/bad_thing.h
@@ -0,0 +1,45 @@
+#ifndef BAD_THING_H
+#define BAD_THING_H
+class payloader{
+public:
+  int refcount;
+  char str[0];
+};
+
+class bad_thing: public std::exception{
+  payloader* load;
+  char* &raw;
+
+public:
+  virtual const char* what() const throw() {
+    return load->str;
+  }
+  bad_thing();
+// copy constructor.
+// It's OK to copy a pointer to the refcount,
+// but it would not be OK to copy the refcount!
+  bad_thing(const bad_thing &other)
+   : load(other.load), raw((char*&) load)
+  {
+    load->refcount++;
+    //xx std::cerr << "Copied! --> " << load->refcount << std::endl;
+  }
+
+  bad_thing(const std::string msg)
+  : raw((char*&) load)
+  {
+    size_t len = msg.size();
+    raw = new char[1+len + sizeof(payloader)];
+    load->refcount = 1;
+    for (unsigned int ii = 0; ii < len; ii++){
+      load->str[ii] = msg[ii];
+    }
+    load->str[len] = 0;
+  }
+  ~bad_thing() throw() {
+    if (--load->refcount) return;
+    //xx  std::cerr << "delete!" << std::endl;
+    delete[] raw;
+  }
+};
+#endif