137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -fcxx-exceptions %s
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// An explicitly-defaulted function may be declared constexpr only if it would
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// have been implicitly declared as constexpr.
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struct S1 {
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constexpr S1() = default; // expected-error {{defaulted definition of default constructor is not constexpr}}
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constexpr S1(const S1&) = default;
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constexpr S1(S1&&) = default;
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constexpr S1 &operator=(const S1&) const = default; // expected-error {{explicitly-defaulted copy assignment operator may not have}}
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constexpr S1 &operator=(S1&&) const = default; // expected-error {{explicitly-defaulted move assignment operator may not have}}
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constexpr ~S1() = default; // expected-error {{destructor cannot be declared constexpr}}
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int n;
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};
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struct NoCopyMove {
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constexpr NoCopyMove() {}
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NoCopyMove(const NoCopyMove&);
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NoCopyMove(NoCopyMove&&);
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};
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struct S2 {
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constexpr S2() = default;
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constexpr S2(const S2&) = default; // expected-error {{defaulted definition of copy constructor is not constexpr}}
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constexpr S2(S2&&) = default; // expected-error {{defaulted definition of move constructor is not constexpr}}
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NoCopyMove ncm;
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};
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// If a function is explicitly defaulted on its first declaration
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// -- it is implicitly considered to be constexpr if the implicit declaration
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// would be
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struct S3 {
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S3() = default;
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S3(const S3&) = default;
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S3(S3&&) = default;
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constexpr S3(int n) : n(n) {}
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int n;
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};
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constexpr S3 s3a = S3(0);
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constexpr S3 s3b = s3a;
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constexpr S3 s3c = S3();
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constexpr S3 s3d; // expected-error {{default initialization of an object of const type 'const S3' without a user-provided default constructor}}
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struct S4 {
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S4() = default;
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S4(const S4&) = default; // expected-note {{here}}
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S4(S4&&) = default; // expected-note {{here}}
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NoCopyMove ncm;
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};
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constexpr S4 s4a{}; // ok
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constexpr S4 s4b = S4(); // expected-error {{constant expression}} expected-note {{non-constexpr constructor}}
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constexpr S4 s4c = s4a; // expected-error {{constant expression}} expected-note {{non-constexpr constructor}}
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struct S5 {
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constexpr S5();
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int n = 1, m = n + 3;
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};
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constexpr S5::S5() = default;
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static_assert(S5().m == 4, "");
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// An explicitly-defaulted function may have a different exception specification
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// from the exception specification on an implicit declaration.
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struct E1 {
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E1() noexcept = default;
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E1(const E1&) noexcept = default;
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E1(E1&&) noexcept = default;
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E1 &operator=(const E1&) noexcept = default;
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E1 &operator=(E1&&) noexcept = default;
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~E1() noexcept = default;
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};
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struct E2 {
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E2() noexcept(false) = default;
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E2(const E2&) noexcept(false) = default;
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E2(E2&&) noexcept(false) = default;
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E2 &operator=(const E2&) noexcept(false) = default;
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E2 &operator=(E2&&) noexcept(false) = default;
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~E2() noexcept(false) = default;
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};
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E2 e2;
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E2 make_e2() noexcept;
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void take_e2(E2&&) noexcept;
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static_assert(!noexcept(E2()), "");
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static_assert(!noexcept(E2(e2)), "");
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static_assert(!noexcept(E2(static_cast<E2&&>(e2))), "");
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static_assert(!noexcept(e2 = e2), "");
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static_assert(!noexcept(e2 = static_cast<E2&&>(e2)), "");
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// FIXME: This expression results in destruction of an E2 temporary; the
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// noexcept expression should evaluate to false.
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static_assert(noexcept(take_e2(make_e2())), "");
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// If a function is explicitly defaulted on its first declaration
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// -- it is implicitly considered to have the same exception-specification as
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// if it had been implicitly declared
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struct E3 {
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E3() = default;
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E3(const E3&) = default;
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E3(E3&&) = default;
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E3 &operator=(const E3&) = default;
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E3 &operator=(E3&&) = default;
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~E3() = default;
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};
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E3 e3;
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static_assert(noexcept(E3(), E3(E3()), E3(e3), e3 = E3(), e3 = e3), "");
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struct E4 {
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E4() noexcept(false);
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E4(const E4&) noexcept(false);
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E4(E4&&) noexcept(false);
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E4 &operator=(const E4&) noexcept(false);
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E4 &operator=(E4&&) noexcept(false);
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~E4() noexcept(false);
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};
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struct E5 {
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E5() = default;
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E5(const E5&) = default;
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E5(E5&&) = default;
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E5 &operator=(const E5&) = default;
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E5 &operator=(E5&&) = default;
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~E5() = default;
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E4 e4;
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};
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E5 e5;
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static_assert(!noexcept(E5()), "");
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static_assert(!noexcept(E5(static_cast<E5&&>(e5))), "");
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static_assert(!noexcept(E5(e5)), "");
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static_assert(!noexcept(e5 = E5()), "");
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static_assert(!noexcept(e5 = e5), "");
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namespace PR13492 {
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struct B {
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B() = default;
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int field;
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};
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void f() {
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const B b; // expected-error {{default initialization of an object of const type 'const PR13492::B' without a user-provided default constructor}}
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}
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}
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