Fix std::vector out-of-bound index check.

Add support for validate_arg_in prototype feature.

gen.py

@@ -659,11 +659,18 @@ def _prepare_c_arg_self(self, conv, out_var, ctx='none', features=[]):
 	def _declare_c_arg(self, ctype, var):
 		return self.decl_var(ctype, var)
 
-	def _convert_c_arg(self, idx, conv, var, ctx='default'):
-		return conv.to_c_call(self.get_arg(idx, ctx), '&%s' % var)
+	def _convert_c_arg(self, idx, conv, var, ctx='default', features=[]):
+		out = conv.to_c_call(self.get_arg(idx, ctx), '&%s' % var)
 
-	def _prepare_c_arg(self, idx, conv, var, ctx='default'):
-		return self._declare_c_arg(conv.arg_storage_ctype, var) + self._convert_c_arg(idx, conv, var, ctx)
+		if 'validate_arg_in' in features:
+			validator = features['validate_arg_in'][idx]
+			if validator is not None:
+				out += validator(self, var, ctx)
+
+		return out
+
+	def _prepare_c_arg(self, idx, conv, var, ctx='default', features=[]):
+		return self._declare_c_arg(conv.arg_storage_ctype, var) + self._convert_c_arg(idx, conv, var, ctx, features)
 
 	def declare_rval(self, out_var):
 		return ''
@@ -720,7 +727,7 @@ def __proto_call(self, self_conv, proto, expr_eval, ctx, fixed_arg_count=None):
 			else:
 				arg_ctype = conv.arg_storage_ctype
 				self._source += self._declare_c_arg(conv.arg_storage_ctype, var)
-				self._source += self._convert_c_arg(argin_idx, conv, var, ctx)
+				self._source += self._convert_c_arg(argin_idx, conv, var, ctx, features)
 				argin_idx += 1
 
 			c_call_args.append(transform_var_ref_to(var, arg_ctype.get_ref(), arg['carg'].ctype.get_ref()))

lib/std.py

@@ -9,15 +9,15 @@ def get_size(self, self_var, out_var):
 		return '%s = %s->size();\n' % (out_var, self_var)
 
 	def get_item(self, self_var, idx, out_var, error_var):
-		out = 'if (size_t(%s) < %s->size())\n' % (idx, self_var)
+		out = 'if ((%s->size() > 0) && (size_t(%s) < %s->size()))\n' % (self_var, idx, self_var)
 		out += '	%s = (*%s)[%s];\n' % (out_var, self_var, idx)
 		out += 'else\n'
 		out += '	%s = true;\n' % error_var
 		return out
 
 	def set_item(self, self_var, idx, in_var, error_var):
 		t_in_var = self.wrapped_conv.prepare_var_from_conv(in_var, self.wrapped_conv.ctype.get_ref())
-		out = 'if (size_t(%s) < %s->size())\n' % (idx, self_var)
+		out = 'if ((%s->size() > 0) && (size_t(%s) < %s->size()))\n' % (self_var, idx, self_var)
 		out += '	(*%s)[%s] = %s;\n' % (self_var, idx, t_in_var)
 		out += 'else\n'
 		out += '	%s = true;\n' % error_var