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option_bool.go
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option_bool.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"fmt"
"github.com/centrifuge/go-substrate-rpc-client/scale"
)
// OptionBool is a structure that can store a Bool or a missing value
// Note that encoding rules are slightly different from other "option" fields
// This implementation was adopted from https://github.com/Joystream/parity-codec-go/blob/develop/noreflect/codec.go
type OptionBool struct {
option
value Bool
}
// NewOptionBool creates an OptionBool with a value
func NewOptionBool(value Bool) OptionBool {
return OptionBool{option{true}, value}
}
// NewOptionBoolEmpty creates an OptionBool without a value
func NewOptionBoolEmpty() OptionBool {
return OptionBool{option{false}, false}
}
// Encode implements encoding for OptionBool as per Rust implementation
func (o OptionBool) Encode(encoder scale.Encoder) error {
var err error
if !o.hasValue {
err = encoder.PushByte(0)
} else {
if o.value {
err = encoder.PushByte(1)
} else {
err = encoder.PushByte(2)
}
}
if err != nil {
return err
}
return nil
}
// Decode implements decoding for OptionBool as per Rust implementation
func (o *OptionBool) Decode(decoder scale.Decoder) error {
b, _ := decoder.ReadOneByte()
switch b {
case 0:
o.hasValue = false
o.value = false
case 1:
o.hasValue = true
o.value = true
case 2:
o.hasValue = true
o.value = false
default:
return fmt.Errorf("unknown byte prefix for encoded OptionBool: %d", b)
}
return nil
}
// SetSome sets a value
func (o *OptionBool) SetSome(value Bool) {
o.hasValue = true
o.value = value
}
// SetNone removes a value and marks it as missing
func (o *OptionBool) SetNone() {
o.hasValue = false
o.value = Bool(false)
}
// Unwrap returns a flag that indicates whether a value is present and the stored value
func (o OptionBool) Unwrap() (ok bool, value Bool) {
return o.hasValue, o.value
}