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"""
Test default template arguments.
"""
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil
class TestDefaultTemplateArgs(TestBase):
@no_debug_info_test
def test(self):
self.build()
lldbutil.run_to_source_breakpoint(
self, "// break here", lldb.SBFileSpec("main.cpp")
)
# Declare a template with a template argument that has a default argument.
self.expect(
"expr --top-level -- template<typename T = int> struct $X { int v; };"
)
# The type we display to the user should omit the argument with the default
# value.
result = self.expect_expr("$X<> x; x", result_type="$X<>")
# The internal name should also always show all arguments (even if they
# have their default value).
self.assertEqual(result.GetTypeName(), "$X<int>")
# Test the template but this time specify a non-default value for the
# template argument.
# Both internal type name and the one we display to the user should
# show the non-default value in the type name.
result = self.expect_expr("$X<long> x; x", result_type="$X<long>")
self.assertEqual(result.GetTypeName(), "$X<long>")
# Test that the formatters are using the internal type names that
# always include all template arguments.
self.expect("type summary add '$X<int>' --summary-string 'summary1'")
self.expect_expr("$X<> x; x", result_summary="summary1")
self.expect("type summary add '$X<long>' --summary-string 'summary2'")
self.expect_expr("$X<long> x; x", result_summary="summary2")
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