lldb/test/API/lang/cpp/default-template-args/TestDefaultTemplateArgs.py

   1 """
   2 Test default template arguments.
   3 """
   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 TestDefaultTemplateArgs(TestBase):
  12     @no_debug_info_test
  13     def test(self):
  14         self.build()
  15         lldbutil.run_to_source_breakpoint(
  16             self, "// break here", lldb.SBFileSpec("main.cpp")
  17         )
  18
  19         # Declare a template with a template argument that has a default argument.
  20         self.expect(
  21             "expr --top-level -- template<typename T = int> struct $X { int v; };"
  22         )
  23
  24         # The type we display to the user should omit the argument with the default
  25         # value.
  26         result = self.expect_expr("$X<> x; x", result_type="$X<>")
  27         # The internal name should also always show all arguments (even if they
  28         # have their default value).
  29         self.assertEqual(result.GetTypeName(), "$X<int>")
  30
  31         # Test the template but this time specify a non-default value for the
  32         # template argument.
  33         # Both internal type name and the one we display to the user should
  34         # show the non-default value in the type name.
  35         result = self.expect_expr("$X<long> x; x", result_type="$X<long>")
  36         self.assertEqual(result.GetTypeName(), "$X<long>")
  37
  38         # Test that the formatters are using the internal type names that
  39         # always include all template arguments.
  40         self.expect("type summary add '$X<int>' --summary-string 'summary1'")
  41         self.expect_expr("$X<> x; x", result_summary="summary1")
  42         self.expect("type summary add '$X<long>' --summary-string 'summary2'")
  43         self.expect_expr("$X<long> x; x", result_summary="summary2")