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[Go] Make enums into real types, add String() (#5235)

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* [Go] Make enums into real types, add String()

This changes the generated code for enums: instead of type aliases,
they're now distinct types, allowing for better type-checking. Some
client code may have to be changed to add casts.

Enum types now have a String() method, so they implement fmt.Stringer.

An EnumValues map is now generated, in addition to the existing
EnumNames map, to easily map strings to values.

Generated enum files are now gofmt-clean.

Fixes #5207

* use example.ColorGreen explicitly

* use valid enum value in mutation test, add new test for "invalid" enum

* add length check and comment
This commit is contained in:
David Reiss
2019-05-17 12:41:39 -07:00
committed by Robert
parent 8d86b5347f
commit 718ddea558
11 changed files with 328 additions and 94 deletions
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4
tests/MyGame/Example/TestSimpleTableWithEnum.go
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@@ -29,13 +29,13 @@ func (rcv *TestSimpleTableWithEnum) Table() flatbuffers.Table {
func (rcv *TestSimpleTableWithEnum) Color() Color {
o := flatbuffers.UOffsetT(rcv._tab.Offset(4))
if o != 0 {
return rcv._tab.GetByte(o + rcv._tab.Pos)
return Color(rcv._tab.GetByte(o + rcv._tab.Pos))
}
return 2
}
func (rcv *TestSimpleTableWithEnum) MutateColor(n Color) bool {
return rcv._tab.MutateByteSlot(4, n)
return rcv._tab.MutateByteSlot(4, byte(n))
}
func TestSimpleTableWithEnumStart(builder *flatbuffers.Builder) {