[libsigc++2] Add test_bind_as_slot.

[Murray Cumming <murrayc src gnome org>]

commit 9526ba21cc3f7b6bf24fa33741b81a8e3e879053
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Mar 1 16:12:50 2016 +0100

    Add test_bind_as_slot.
    
    This tests sigc::bind()'s indirect use of adaptor_functor<>.
    I added this because this doesn't work yet in the variadic_bind branch.

 tests/Makefile.am          |    2 +
 tests/test_bind_as_slot.cc |   71 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index fd3f187..f175f32 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -23,6 +23,7 @@ check_PROGRAMS = \
   test_accum_iter \
   test_accumulated \
   test_bind \
+  test_bind_as_slot \
   test_bind_ref \
   test_bind_refptr \
   test_bind_return \
@@ -59,6 +60,7 @@ sigc_test_util = testutilities.h testutilities.cc
 test_accum_iter_SOURCES      = test_accum_iter.cc $(sigc_test_util)
 test_accumulated_SOURCES     = test_accumulated.cc $(sigc_test_util)
 test_bind_SOURCES            = test_bind.cc $(sigc_test_util)
+test_bind_as_slot_SOURCES    = test_bind_as_slot.cc $(sigc_test_util)
 test_bind_ref_SOURCES        = test_bind_ref.cc $(sigc_test_util)
 test_bind_refptr_SOURCES     = test_bind_refptr.cc $(sigc_test_util)
 test_bind_return_SOURCES     = test_bind_return.cc $(sigc_test_util)
diff --git a/tests/test_bind_as_slot.cc b/tests/test_bind_as_slot.cc
new file mode 100644
index 0000000..28bcf4f
--- /dev/null
+++ b/tests/test_bind_as_slot.cc
@@ -0,0 +1,71 @@
+// -*- c++ -*-
+/* Copyright 2002, The libsigc++ Development Team
+ *  Assigned to public domain.  Use as you wish without restriction.
+ */
+
+#include "testutilities.h"
+#include <sigc++/adaptors/bind.h>
+#include <sigc++/functors/slot.h>
+#include <sstream>
+#include <string>
+#include <functional> //For std::ref().
+#include <cstdlib>
+
+namespace
+{
+
+std::ostringstream result_stream;
+
+bool func_to_bind(int a, int b)
+{
+  result_stream << "func_to_bind(" << a << ", " << b << ")";
+  return true;
+}
+
+bool func_to_bind_with_iter(int a, std::string::iterator& b)
+{
+  result_stream << "func_to_bind_with_iter(" << a << ", " << *b << ")";
+  return true;
+}
+
+bool func_to_bind_with_const_iter(int a, std::string::const_iterator& b)
+{
+  result_stream << "func_to_bind_with_const_iter(" << a << ", " << *b << ")";
+  return true;
+}
+
+} // end anonymous namespace
+
+int main(int argc, char* argv[])
+{
+  auto util = TestUtilities::get_instance();
+
+  if (!util->check_command_args(argc, argv))
+    return util->get_result_and_delete_instance() ? EXIT_SUCCESS : EXIT_FAILURE;
+
+
+  //Test that sigc::bind()'s result can be converted to a sigc::slot<>.
+  {
+    sigc::slot<bool, int> bound_slot = sigc::bind(sigc::ptr_fun(&func_to_bind), 2);
+    bound_slot(1);
+    util->check_result(result_stream, "func_to_bind(1, 2)");
+  }
+
+  //Test with a non-const iterator:
+  {
+    std::string c = "2";
+    sigc::slot<bool, int> bound_slot = sigc::bind(sigc::ptr_fun(&func_to_bind_with_iter), c.begin());
+    bound_slot(1);
+    util->check_result(result_stream, "func_to_bind_with_iter(1, 2)");
+  }
+
+  //Test with a const_iterator:
+  {
+    const std::string c = "2";
+    sigc::slot<bool, int> bound_slot = sigc::bind(sigc::ptr_fun(&func_to_bind_with_const_iter), c.begin());
+    bound_slot(1);
+    util->check_result(result_stream, "func_to_bind_with_const_iter(1, 2)");
+  }
+
+  return util->get_result_and_delete_instance() ? EXIT_SUCCESS : EXIT_FAILURE;
+}