Merge pull request #212 from abergmeier/master

Increase available information on invocation error.

example/example11.ref

@@ -29,7 +29,7 @@ kw_func(x=5, y=10)
 kw_func(x=5, y=10)
 Caught expected exception: Incompatible function arguments. The following argument types are supported:
     1. (x : int = 100L, y : int = 200L) -> NoneType
-
+    Invoked with:
 kw_func4: 13 17 
 kw_func4: 1 2 3 
 kw_func(x=1234, y=5678)

example/example14.ref

@@ -11,7 +11,7 @@ Got void ptr : 0x7f9ba0f3c430
 Called Example1 destructor (0)
 Caught expected exception: Incompatible function arguments. The following argument types are supported:
     1. (capsule) -> NoneType
-
+    Invoked with: [1, 2, 3]
 None
 Got null str : 0x0
 <example.StringList object at 0x10d3277a0>

example/example5.ref

@@ -14,7 +14,7 @@ Polly is a parrot
 Molly is a dog
 The following error is expected: Incompatible function arguments. The following argument types are supported:
     1. (example.Dog) -> NoneType
-
+    Invoked with: <Pet object at 0>
 Callback function 1 called!
 False
 Callback function 2 called : Hello, x, True, 5

example/issues.ref

@@ -7,8 +7,8 @@ Yay..
 0==0, 1==1, 2==2, 3==3, 4==4, 5==5, 6==6, 7==7, 8==8, 9==9, 
 Failed as expected: Incompatible function arguments. The following argument types are supported:
     1. (example.issues.ElementA) -> NoneType
-
+    Invoked with: None
 Failed as expected: Incompatible function arguments. The following argument types are supported:
     1. (int) -> int
-
+    Invoked with: 5.2
 12.0

include/pybind11/pybind11.h

@@ -422,6 +422,14 @@ protected:
                 msg += it2->signature;
                 msg += "\n";
             }
+            msg += "    Invoked with: ";
+            tuple args_(args, true);
+            for( std::size_t ti = 0; ti != args_.size(); ++ti)
+            {
+                msg += static_cast<std::string>(static_cast<object>(args_[ti]).str());
+                if ((ti + 1) != args_.size() )
+                    msg += ", ";
+            }
             PyErr_SetString(PyExc_TypeError, msg.c_str());
             return nullptr;
         } else if (!result) {