Differential D62825 Diff 207596 cfe/trunk/test/SemaCXX/builtin-bit-cast.cpp

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				// RUN: %clang_cc1 -verify -std=c++2a -fsyntax-only -triple x86_64-apple-macosx10.14.0 %s
				// RUN: %clang_cc1 -verify -std=c++2a -fsyntax-only -triple x86_64-apple-macosx10.14.0 %s -fno-signed-char

				#if !__has_builtin(__builtin_bit_cast)
				#error
				#endif

				template <class T, T v>
				T instantiate() {
				return __builtin_bit_cast(T, v);
				}

				int x = instantiate<int, 32>();

				struct secret_ctor {
				char member;

				private: secret_ctor() = default;
				};

				void test1() {
				secret_ctor c = __builtin_bit_cast(secret_ctor, (char)0);
				}

				void test2() {
				constexpr int i = 0;
				// expected-error@+1{{__builtin_bit_cast source size does not equal destination size (4 vs 1)}}
				constexpr char c = __builtin_bit_cast(char, i);
				}

				struct not_trivially_copyable {
				virtual void foo() {}
				};

				// expected-error@+1{{__builtin_bit_cast source type must be trivially copyable}}
				constexpr unsigned long ul = __builtin_bit_cast(unsigned long, not_trivially_copyable{});

				// expected-error@+1 {{__builtin_bit_cast destination type must be trivially copyable}}
				constexpr long us = __builtin_bit_cast(unsigned long &, 0L);