Viewing file:  subscript2.C (1.58 KB) -rw-r--r--
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// P2128R6
// { dg-do compile }
// { dg-options "-std=c++23" }
struct S
{
S () : a {} {};
int &operator[] () { return a[0]; }
int &operator[] (int x) { return a[x]; }
int &operator[] (int x, long y) { return a[x + y * 8]; }
int a[64];
};
struct T
{
operator int () { return 42; };
};
int buf[64];
struct U
{
operator int * () { return buf; }
};
struct V
{
V () : a {} {};
V (int x, int y, int z) : a {x, y, z} {};
int &operator[] () { return a[0]; } // { dg-message "candidate" }
int &operator[] (int x, long y) { return a[x + y * 8]; } // { dg-message "candidate" }
int a[64];
};
void
foo ()
{
S s;
T t;
U u;
V v;
auto &a = buf[]; // { dg-error "built-in subscript operator without expression list" }
auto &b = buf[1, 2]; // { dg-warning "top-level comma expression in array subscript changed meaning in" }
auto &c = s[1, 2, 3]; // { dg-warning "top-level comma expression in array subscript changed meaning in" }
auto &d = v[1]; // { dg-error "no match for 'operator\\\[\\\]' in 'v\\\[1\\\]' \\\(operand types are 'V' and 'int'\\\)" }
auto &e = v[1, 2, 3]; // { dg-error "no match for call to 'V::operator\\\[\\\] \\\(int, int, int\\\)'" }
auto &f = t[42, u]; // { dg-warning "top-level comma expression in array subscript changed meaning in" }
auto &g = u[42, t]; // { dg-warning "top-level comma expression in array subscript changed meaning in" }
auto &h = buf[42, 2.5]; // { dg-warning "top-level comma expression in array subscript changed meaning in" }
// { dg-error "invalid types \[^\n\r]* for array subscript" "" { target *-*-* } .-1 }
}
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