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add __traits getBitfieldOffset and getBitfieldWidth (#17043)

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Walter Bright 2024-11-10 11:22:59 -08:00 • committed by GitHub
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Add __traits getBitfieldOffset and getBitfieldWidth
This completes the introspection capabilities of builtin bitfields. For example:
---
struct S
{
int a,b;
int :2, c:3;
}
static assert(__traits(getBitfieldOffset, S.b) == 0);
static assert(__traits(getBitfieldOffset, S.c) == 2);
static assert(__traits(getBitfieldWidth, S.b) == 32);
static assert(__traits(getBitfieldWidth, S.c) == 3);
---