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65 lines
2.9 KiB
C++
65 lines
2.9 KiB
C++
//===--- AssertImplements.h - Assert that a class overrides a function ----===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides the ASSERT_IMPLEMENTS macro, which statically
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// asserts that a class implements a function.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_ASSERTIMPLEMENTS_H
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#define SWIFT_BASIC_ASSERTIMPLEMENTS_H
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#include <type_traits>
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namespace swift {
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template <class ExpectedType, class BaseType>
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BaseType get_implementing_class_helper(ExpectedType BaseType::*member);
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#define GET_IMPLEMENTING_CLASS(DerivedClass, MemberName, ExpectedType) \
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decltype(::swift::get_implementing_class_helper<ExpectedType>( \
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&DerivedClass::MemberName))
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/// Statically assert that DerivedClass overrides the instance method
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/// MemberName (at overload ExpectedType). It doesn't have to be
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/// overridden directly in DerivedClass; it just can't still be the
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/// implementation from BaseClass.
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#define ASSERT_IMPLEMENTS(DerivedClass, BaseClass, MemberName, ExpectedType) \
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static_assert(!::std::is_same<BaseClass, \
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GET_IMPLEMENTING_CLASS(DerivedClass, MemberName,\
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ExpectedType) \
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>::value, \
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"" #DerivedClass " does not properly override " #MemberName)
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template <class T, T *impl0, T *impl1> struct is_same_pointer {
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enum { value = false };
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};
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template <class T, T *impl> struct is_same_pointer<T, impl, impl> {
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enum { value = true };
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};
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/// Statically assert that DerivedClass overrides the static method
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/// MemberName (at overload ExpectedType). It doesn't have to be
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/// overridden directly in DerivedClass; it just can't still be the
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/// implementation from BaseClass.
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#define ASSERT_IMPLEMENTS_STATIC(DerivedClass, BaseClass, MemberName, \
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ExpectedType) \
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static_assert(!::swift::is_same_pointer<ExpectedType, \
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&BaseClass::MemberName, \
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&DerivedClass::MemberName>::value, \
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"" #DerivedClass " does not properly override " #MemberName)
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} // end namespace swift
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#endif // SWIFT_BASIC_ASSERTIMPLEMENTS_H
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