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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
// An explicitly-defaulted function may be declared constexpr only if it would
// have been implicitly declared as constexpr.
struct S1 {
constexpr S1() = default; // expected-error {{defaulted definition of default constructor is not constexpr}}
constexpr S1(const S1&) = default;
constexpr S1(S1&&) = default;
constexpr S1 &operator=(const S1&) = default; // expected-error {{explicitly-defaulted copy assignment operator may not have}}
constexpr S1 &operator=(S1&&) = default; // expected-error {{explicitly-defaulted move assignment operator may not have}}
constexpr ~S1() = default; // expected-error {{destructor cannot be marked constexpr}}
int n;
};
struct NoCopyMove {
constexpr NoCopyMove() {}
NoCopyMove(const NoCopyMove&);
NoCopyMove(NoCopyMove&&);
};
struct S2 {
constexpr S2() = default;
constexpr S2(const S2&) = default; // expected-error {{defaulted definition of copy constructor is not constexpr}}
constexpr S2(S2&&) = default; // expected-error {{defaulted definition of move constructor is not constexpr}}
NoCopyMove ncm;
};
// If a function is explicitly defaulted on its first declaration
// -- it is implicitly considered to be constexpr if the implicit declaration
// would be
struct S3 {
S3() = default; // expected-note {{here}}
S3(const S3&) = default;
S3(S3&&) = default;
constexpr S3(int n) : n(n) {}
int n;
};
constexpr S3 s3a = S3(0);
constexpr S3 s3b = s3a;
constexpr S3 s3c = S3(); // expected-error {{constant expression}} expected-note {{non-constexpr constructor}}
struct S4 {
S4() = default;
S4(const S4&) = default; // expected-note {{here}}
S4(S4&&) = default; // expected-note {{here}}
NoCopyMove ncm;
};
constexpr S4 s4a; // ok
constexpr S4 s4b = S4(); // expected-error {{constant expression}} expected-note {{non-constexpr constructor}}
constexpr S4 s4c = s4a; // expected-error {{constant expression}} expected-note {{non-constexpr constructor}}
struct S5 {
constexpr S5();
int n = 1, m = n + 3;
};
constexpr S5::S5() = default;
static_assert(S5().m == 4, "");
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