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// PR c++/91353 - P1331R2: Allow trivial default init in constexpr contexts.
// { dg-do compile { target c++20 } }
struct S {
int a = 1;
constexpr S() = default;
};
constexpr S s;
union U {
int a = 1;
constexpr U() = default;
};
constexpr U u;
struct S2 {
int a;
constexpr S2() = default;
};
constexpr S2 s2; // { dg-error "uninitialized .const s2." }
union U2 {
int a;
constexpr U2() = default;
};
constexpr U2 u2; // { dg-error "uninitialized .const u2." }
struct S3 {
// FIXME if it's anonymous union, we don't give the error below
union {
int a;
} u;
constexpr S3() = default;
};
constexpr S3 s3; // { dg-error "uninitialized .const s3." }
struct S4 {
// FIXME if it's anonymous union, we don't give the error below
union {
int n;
} u;
constexpr S4() = default;
};
constexpr S4 s4; // { dg-error "uninitialized .const s4." }
struct S5 {
union {
int n = 0;
};
// FIXME if it's anonymous union, we don't give the error below
union {
int m;
} u;
constexpr S5() = default;
};
constexpr S5 s5; // { dg-error "uninitialized .const s5.|not a constant expression" }
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