diff options
Diffstat (limited to 'src/pkg/reflect/value.go')
| -rw-r--r-- | src/pkg/reflect/value.go | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/src/pkg/reflect/value.go b/src/pkg/reflect/value.go index 3abe13e04..bfeb3267c 100644 --- a/src/pkg/reflect/value.go +++ b/src/pkg/reflect/value.go @@ -11,7 +11,7 @@ import ( "unsafe" ) -const ptrSize = uintptr(unsafe.Sizeof((*byte)(nil))) +const ptrSize = unsafe.Sizeof((*byte)(nil)) const cannotSet = "cannot set value obtained from unexported struct field" // TODO: This will have to go away when @@ -933,7 +933,7 @@ func (v Value) Kind() Kind { } // Len returns v's length. -// It panics if v's Kind is not Array, Chan, Map, or Slice. +// It panics if v's Kind is not Array, Chan, Map, Slice, or String. func (v Value) Len() int { iv := v.internal() switch iv.kind { @@ -945,6 +945,8 @@ func (v Value) Len() int { return int(maplen(iv.word)) case Slice: return (*SliceHeader)(iv.addr).Len + case String: + return (*StringHeader)(iv.addr).Len } panic(&ValueError{"reflect.Value.Len", iv.kind}) } @@ -1023,6 +1025,23 @@ func (v Value) Method(i int) Value { return Value{v.Internal, i + 1} } +// MethodByName returns a function value corresponding to the method +// of v with the given name. +// The arguments to a Call on the returned function should not include +// a receiver; the returned function will always use v as the receiver. +// It returns the zero Value if no method was found. +func (v Value) MethodByName(name string) Value { + iv := v.internal() + if iv.kind == Invalid { + panic(&ValueError{"reflect.Value.MethodByName", Invalid}) + } + m, ok := iv.typ.MethodByName(name) + if ok { + return Value{v.Internal, m.Index + 1} + } + return Value{} +} + // NumField returns the number of fields in the struct v. // It panics if v's Kind is not Struct. func (v Value) NumField() int { |