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// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -Wno-bitfield-constant-conversion -verify=expected,both %s
// RUN: %clang_cc1 -verify=ref,both -Wno-bitfield-constant-conversion %s
// RUN: %clang_cc1 -std=c++20 -fexperimental-new-constant-interpreter -Wno-bitfield-constant-conversion -verify=expected,both %s
// RUN: %clang_cc1 -std=c++20 -verify=ref,both -Wno-bitfield-constant-conversion %s
namespace Basic {
struct A {
unsigned int a : 2;
constexpr A() : a(0) {}
constexpr A(int a) : a(a) {}
};
constexpr A a{1};
static_assert(a.a == 1, "");
constexpr A a2{10};
static_assert(a2.a == 2, "");
constexpr int storeA() {
A a;
a.a = 10;
return a.a;
}
static_assert(storeA() == 2, "");
constexpr int storeA2() {
A a;
return a.a = 10;
}
static_assert(storeA2() == 2, "");
#if __cplusplus >= 202002
struct Init1 {
unsigned a : 2 = 1;
};
constexpr Init1 I1{};
static_assert(I1.a == 1, "");
struct Init2 {
unsigned a : 2 = 100;
};
constexpr Init2 I2{};
static_assert(I2.a == 0, "");
#endif
struct Init3 {
unsigned a : 2;
constexpr Init3() : a(100) {}
};
constexpr Init3 I3{};
static_assert(I3.a == 0, "");
}
namespace Overflow {
struct A {int c:3;};
constexpr int f() {
A a1{3};
return a1.c++;
}
static_assert(f() == 3, "");
}
namespace Compound {
struct A {
unsigned int a : 2;
constexpr A() : a(0) {}
constexpr A(int a) : a(a) {}
};
constexpr unsigned add() {
A a;
a.a += 10;
return a.a;
}
static_assert(add() == 2, "");
constexpr unsigned sub() {
A a;
a.a -= 10;
return a.a;
}
static_assert(sub() == 2, "");
constexpr unsigned mul() {
A a(1);
a.a *= 5;
return a.a;
}
static_assert(mul() == 1, "");
constexpr unsigned div() {
A a(2);
a.a /= 2;
return a.a;
}
static_assert(div() == 1, "");
}
namespace test0 {
extern int int_source();
struct A {
int aField;
int bField;
};
struct B {
int onebit : 2;
int twobit : 6;
int intField;
};
struct C : A, B {
};
void b(C &c) {
c.onebit = int_source();
}
}
namespace NonConstBitWidth {
int n3 = 37; // both-note {{declared here}}
struct S {
int l : n3; // both-error {{constant expression}} \
// both-note {{read of non-const variable}}
};
}
namespace IncDecOverflow {
constexpr bool test1() {
struct {unsigned u: 5; } a {};
a.u--;
return a.u == 31;
}
static_assert(test1(), "");
constexpr bool test2() {
struct {unsigned u: 5; } a {};
--a.u;
return a.u == 31;
}
static_assert(test2(), "");
constexpr bool test3() {
int x = 0;
struct {unsigned u: 5; } a {};
x = a.u--;
return a.u == 31;
}
static_assert(test3(), "");
constexpr bool test4() {
int x = 0;
struct {unsigned u: 5; } a {};
x = --a.u;
return a.u == 31;
}
static_assert(test4(), "");
constexpr bool test5() {
struct {unsigned u: 5; } a {};
a.u = 31;
++a.u;
return a.u == 0;
}
static_assert(test5(), "");
constexpr bool test6() {
struct {unsigned u: 5; } a {};
a.u = 31;
++a.u;
return a.u == 0;
}
static_assert(test6(), "");
constexpr bool test7() {
struct {unsigned u: 5; } a {};
a.u = 31;
a.u++;
return a.u == 0;
}
static_assert(test7(), "");
constexpr bool test8() {
int x = 0;
struct {unsigned u: 5; } a {};
a.u = 31;
x = a.u++;
return a.u == 0;
}
static_assert(test8(), "");
constexpr bool test9() {
int x = 0;
struct {unsigned u: 5; } a {};
a.u = 31;
x = ++a.u;
return a.u == 0;
}
static_assert(test9(), "");
}
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