diff --git a/src/reflect/value.go b/src/reflect/value.go index 5276af6fd6..6830057d61 100644 --- a/src/reflect/value.go +++ b/src/reflect/value.go @@ -45,17 +45,19 @@ type Value struct { ptr unsafe.Pointer // flag holds metadata about the value. - // The lowest bits are flag bits: + // + // The lowest five bits give the Kind of the value, mirroring typ.Kind(). + // + // The next set of bits are flag bits: // - flagStickyRO: obtained via unexported not embedded field, so read-only // - flagEmbedRO: obtained via unexported embedded field, so read-only // - flagIndir: val holds a pointer to the data - // - flagAddr: v.CanAddr is true (implies flagIndir) + // - flagAddr: v.CanAddr is true (implies flagIndir and ptr is non-nil) // - flagMethod: v is a method value. - // The next five bits give the Kind of the value. - // This repeats typ.Kind() except for method values. - // The remaining 23+ bits give a method number for method values. - // If flag.kind() != Func, code can assume that flagMethod is unset. // If ifaceIndir(typ), code can assume that flagIndir is set. + // + // The remaining 22+ bits give a method number for method values. + // If flag.kind() != Func, code can assume that flagMethod is unset. flag // A method value represents a curried method invocation