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// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify=expected,both %s
// RUN: %clang_cc1 -verify=ref,both %s
constexpr int a = 10;
constexpr const int &b = a;
static_assert(a == b, "");
constexpr int assignToReference() {
int a = 20;
int &b = a;
b = 100;
return a;
}
static_assert(assignToReference() == 100, "");
constexpr void setValue(int &dest, int val) {
dest = val;
}
constexpr int checkSetValue() {
int l = 100;
setValue(l, 200);
return l;
}
static_assert(checkSetValue() == 200, "");
constexpr int readLocalRef() {
int a = 20;
int &b = a;
return b;
}
static_assert(readLocalRef() == 20, "");
constexpr int incRef() {
int a = 0;
int &b = a;
b = b + 1;
return a;
}
static_assert(incRef() == 1, "");
template<const int &V>
constexpr void Plus3(int &A) {
A = V + 3;
}
constexpr int foo = 4;
constexpr int callTemplate() {
int a = 3;
Plus3<foo>(a);
return a;
}
static_assert(callTemplate() == 7, "");
constexpr int& getValue(int *array, int index) {
return array[index];
}
constexpr int testGetValue() {
int values[] = {1, 2, 3, 4};
getValue(values, 2) = 30;
return values[2];
}
static_assert(testGetValue() == 30, "");
constexpr const int &MCE = 20;
static_assert(MCE == 20, "");
static_assert(MCE == 30, ""); // both-error {{static assertion failed}} \
// both-note {{evaluates to '20 == 30'}}
constexpr int LocalMCE() {
const int &m = 100;
return m;
}
static_assert(LocalMCE() == 100, "");
static_assert(LocalMCE() == 200, ""); // both-error {{static assertion failed}} \
// both-note {{evaluates to '100 == 200'}}
struct S {
int i, j;
};
constexpr int RefToMemberExpr() {
S s{1, 2};
int &j = s.i;
j = j + 10;
return j;
}
static_assert(RefToMemberExpr() == 11, "");
struct Ref {
int &a;
};
constexpr int RecordWithRef() {
int m = 100;
Ref r{m};
m = 200;
return r.a;
}
static_assert(RecordWithRef() == 200, "");
struct Ref2 {
int &a;
constexpr Ref2(int &a) : a(a) {}
};
constexpr int RecordWithRef2() {
int m = 100;
Ref2 r(m);
m = 200;
return r.a;
}
static_assert(RecordWithRef2() == 200, "");
const char (&nonextended_string_ref)[3] = {"hi"};
static_assert(nonextended_string_ref[0] == 'h', "");
static_assert(nonextended_string_ref[1] == 'i', "");
static_assert(nonextended_string_ref[2] == '\0', "");
/// This isa non-constant context. Reading A is not allowed,
/// but taking its address is.
int &&A = 12;
int arr[!&A];
namespace Temporaries {
struct A { int n; };
struct B { const A &a; };
const B j = {{1}}; // both-note {{temporary created here}}
static_assert(j.a.n == 1, ""); // both-error {{not an integral constant expression}} \
// both-note {{read of temporary is not allowed in a constant expression outside the expression that created the temporary}}
}
namespace Params {
typedef __SIZE_TYPE__ size_t;
template <class _Tp, size_t _Np>
constexpr _Tp* end(_Tp (&__array)[_Np]) noexcept {
return __array + _Np;
}
struct classnames {
const char* elem_;
int a;
};
constexpr classnames ClassNames[] = {
{"a", 0},
{"b", 1},
{"b", 1},
{"b", 1},
{"b", 1},
{"b", 1},
{"b", 1},
{"b", 1},
};
constexpr bool foo() {
/// This will instantiate end() with ClassNames.
/// In Sema, we will constant-evaluate the return statement, which is
/// something like __array + 8. The APValue we return for this
/// may NOT have a LValuePath set, since it's for a parameter
/// of LValueReferenceType.
end(ClassNames);
return true;
}
static_assert(foo());
}
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