Examples/test-suite/python/cpp20_concepts_constrained_param_runme.py - master - niceSOFT/swig

Examples/test-suite/python/cpp20_concepts_constrained_param_runme.py

75 строк2 KB

William S Fulton

C++20: accept template-id concept-id as a type-constraint

13 май 2026, 01:04

13 май 2026, 01:04797c3c4

from cpp20_concepts_constrained_param import *

from swig_test_utils import swig_check


# 1. Single type constrained parameter.
swig_check(cube_int(3), 27)
swig_check(cube_double(2.5), 15.625)

# 2. ::-qualified concept-id.
swig_check(half_int(10), 5)

# 3. Mixed type-constraint + plain typename.
swig_check(scale_di(2.5, 4), 10.0)

# 4. Default template argument paired with a type-constraint.
swig_check(identity_int(7), 7)

# 5. Two type-constraints in one head.
swig_check(combine_id(40, 2), 42)

# 6. Variadic type constrained pack.
swig_check(count_numeric_1(1), 1)
swig_check(count_numeric_3(1, 2.0, 3), 3)

# 6a. Leading plain typename followed by a type constrained pack.
swig_check(tag_count_si("hello", 1), 1)
swig_check(tag_count_s3("hello", 1, 2.0, 3), 3)

# 6b. Two type-constraints with the trailing one a variadic pack.
swig_check(small_tag_count_ci('x', 1), 1)
swig_check(small_tag_count_c3('x', 1, 2.0, 3), 3)

# 7. Constrained class template.
b = BoxInt(11)
swig_check(b.get(), 11)
b.set(42)
swig_check(b.get(), 42)

bd = BoxDouble(3.5)
swig_check(bd.get(), 3.5)

# 8. Constrained class template using a refining concept.
fb = FloatBoxFloat(1.25)
swig_check(fb.get(), 1.25)

# 9. Concept not parsed by SWIG.
swig_check(tag_int(41), 42)

# 10a. std lib template-id concept-id.
swig_check(to_int_d(3.5), 3)

# 10b. std lib template-id concept-id on a class template.
cc = ConvertibleCrateDouble(4.25)
swig_check(cc.get(), 4)

# 10c. User defined 2-param concept in template-id form.
swig_check(first_int_d(3.5), 3)

# 10d. Variadic template-id concept-id pack.
swig_check(count_pair_1(1), 1)
swig_check(count_pair_3(1, 2.0, 'x'), 3)

# 10e. Default template argument paired with a template-id concept-id.
swig_check(with_default_int(42), 42)
swig_check(with_default_d(3.5), 3)

# 10f. Constrained class template with a template-id concept-id.
c = CrateInt(5)
swig_check(c.get(), 5)
cd = CrateDouble(3.25)
swig_check(cd.get(), 3.25)

# 10g. ::-qualified template-id concept-id.
swig_check(nested_pair_d(7.5), 7)