lldb/test/API/lang/cpp/class-template-parameter-pack/TestTemplatePackArgs.py

   1 """
   2 Test that the type of arguments to C++ template classes that have variadic
   3 parameters can be enumerated.
   4 """
   5 import lldb
   6 from lldbsuite.test.decorators import *
   7 from lldbsuite.test.lldbtest import *
   8 from lldbsuite.test import lldbutil
   9
  10
  11 class TemplatePackArgsTestCase(TestBase):
  12     def test_template_argument_pack(self):
  13         self.build()
  14         (_, _, thread, _) = lldbutil.run_to_source_breakpoint(
  15             self, "breakpoint here", lldb.SBFileSpec("main.cpp"), exe_name="a.out"
  16         )
  17         frame = thread.GetSelectedFrame()
  18
  19         empty_pack = frame.FindVariable("emptyPack")
  20         self.assertTrue(
  21             empty_pack.IsValid(), "make sure we find the emptyPack variable"
  22         )
  23
  24         only_pack = frame.FindVariable("onlyPack")
  25         self.assertTrue(only_pack.IsValid(), "make sure we find the onlyPack variable")
  26         self.assertEqual(only_pack.GetType().GetNumberOfTemplateArguments(), 4)
  27         self.assertEqual(
  28             only_pack.GetType().GetTemplateArgumentType(0).GetName(), "int"
  29         )
  30         self.assertEqual(
  31             only_pack.GetType().GetTemplateArgumentType(1).GetName(), "char"
  32         )
  33         self.assertEqual(
  34             only_pack.GetType().GetTemplateArgumentType(2).GetName(), "double"
  35         )
  36         # Access the C<double, 42> template parameter.
  37         nested_template = only_pack.GetType().GetTemplateArgumentType(3)
  38         self.assertEqual(nested_template.GetName(), "D<int, int, bool>")
  39         self.assertEqual(nested_template.GetNumberOfTemplateArguments(), 3)
  40         self.assertEqual(nested_template.GetTemplateArgumentType(0).GetName(), "int")
  41         self.assertEqual(nested_template.GetTemplateArgumentType(1).GetName(), "int")
  42         self.assertEqual(nested_template.GetTemplateArgumentType(2).GetName(), "bool")