# HG changeset patch
# User klao
# Date 1083278357 0
# Node ID afbdf8a3a633e40de9801fbf79dee90421f5179f
# Parent  32c3548ecc2a459a5cbc33abc9e1a307320aa420
Basic error handling facilities
(and possibly a g++-3.4.0 bug)

diff -r 32c3548ecc2a -r afbdf8a3a633 src/include/error.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/include/error.h	Thu Apr 29 22:39:17 2004 +0000
@@ -0,0 +1,64 @@
+// -*- C++ -*- //
+
+#ifndef HUGO_ERROR_H
+#define HUGO_ERROR_H
+
+//! \file
+//! \brief Basic error handling (signaling) routines.
+
+#include <string>
+#include <sstream>
+
+
+namespace hugo {
+
+  /**
+   * \brief Generic exception class.
+   *
+   * \todo Do we need this?
+   *
+   * \todo Don't we need different kind of exceptions for different kind
+   * of errors?
+   * Shouldn't we use <stdexcept> instead?
+   */
+  class Exception : public std::exception {
+  protected:
+    std::ostringstream buf;
+  public:
+    Exception() {}
+    explicit Exception(const std::string &s) { buf << s; }
+    Exception(const Exception &e) { buf << e.buf.str(); }
+    virtual ~Exception() throw() {}
+    
+    virtual const char* what() const throw() {
+      return buf.str().c_str();
+    }
+
+    Exception& operator<<(std::string const& s) { buf << s; return *this; }
+    Exception& operator<<(char const *s) { buf << s; return *this; }
+    Exception& operator<<(int i) { buf << i; return *this; }
+  };
+
+  /**
+   * \brief Generic error signaling function.
+   *
+   * \todo Do we really need this? Is it helpful?
+   */
+  inline void fault(const std::string &msg) {
+    throw Exception(msg);
+  }
+
+  /**
+   * \brief Macro for mark not yet implemented features.
+   *
+   * \todo Is this the right place for this? It should be used only in
+   * modules under development.
+   */
+
+# define FIXME(msg) \
+    do { throw ::hugo::Exception("FIXME: " msg) << " (in: "    \
+      << __FILE__ << ", " << __LINE__ << ")";                  \
+    } while(false)
+
+}
+#endif // HUGO_ERROR_H
diff -r 32c3548ecc2a -r afbdf8a3a633 src/test/error_test.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test/error_test.cc	Thu Apr 29 22:39:17 2004 +0000
@@ -0,0 +1,57 @@
+#include <iostream>
+
+#include <error.h>
+
+using namespace hugo;
+using std::cout;
+using std::endl;
+
+void faulty_fn() {
+  fault("This is a fault message");
+}
+
+void exception_fn() {
+  throw Exception("This is a fn throwing excpt with some args: ") 
+    << 5 << ", " << 18;
+}
+
+void unfinished_fn() {
+  FIXME("unfinished_fn() is unfinished!");
+}
+
+
+int main() {
+  bool no_errors = false;
+
+  try {
+    cout << "Trying a faulty function\n";
+    faulty_fn();
+    no_errors = true;
+    cout << "FAILED!\n";
+  }
+  catch(const Exception &e) {
+    cout << "E: " << e.what() << endl;
+  }
+
+  try {
+    cout << "Trying a function throwing Exception\n";
+    exception_fn();
+    no_errors = true;
+    cout << "FAILED!\n";
+  }
+  catch(const Exception &e) {
+    cout << "E: " << e.what() << endl;
+  }
+
+  try {
+    cout << "Trying a function using FIXME\n";
+    unfinished_fn();
+    no_errors = true;
+    cout << "FAILED!\n";
+  }
+  catch(const Exception &e) {
+    cout << "E: " << e.what() << endl;
+  }
+
+  return no_errors ? 1 : 0;
+}
diff -r 32c3548ecc2a -r afbdf8a3a633 src/test/makefile
--- a/src/test/makefile	Thu Apr 29 19:38:53 2004 +0000
+++ b/src/test/makefile	Thu Apr 29 22:39:17 2004 +0000
@@ -2,7 +2,7 @@
 CXXFLAGS += -Wall -O3 -ansi -pedantic $(INCLUDEDIRS) 
 #LEDAROOT ?= /ledasrc/LEDA-4.1
 
-BINARIES = dijkstra_heap_test unionfind_test
+BINARIES = dijkstra_heap_test unionfind_test error_test
 
 ifdef GCCVER
 CXX := g++-$(GCCVER)