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https://github.com/ethereum/go-ethereum.git
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ba9ab538b9
## Why this should be merged Adds default-value support to the `options` package, which could previously only create configured types from zero values. ## How this works Exposes the option-application loop as the `ApplyTo()` function and refactors `As()` to share this code path. ## How this was tested Testable example acting as a unit test.
47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
// Copyright 2024 the libevm authors.
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//
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// The libevm additions to go-ethereum are free software: you can redistribute
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// them and/or modify them under the terms of the GNU Lesser General Public License
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// as published by the Free Software Foundation, either version 3 of the License,
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// or (at your option) any later version.
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//
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// The libevm additions are distributed in the hope that they will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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// General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see
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// <http://www.gnu.org/licenses/>.
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// Package options provides a generic mechanism for defining configuration of
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// arbitrary types.
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package options
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// An Option configures values of arbitrary type.
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type Option[T any] interface {
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Configure(*T)
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}
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// As applies Options to a zero-value T, which it then returns.
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func As[T any](opts ...Option[T]) *T {
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var t T
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return ApplyTo(&t, opts...)
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}
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// ApplyTo applies Options to the T and returns it for convenience.
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func ApplyTo[T any](t *T, opts ...Option[T]) *T {
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for _, o := range opts {
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o.Configure(t)
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}
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return t
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}
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// A Func converts a function into an [Option], using itself as the Configure
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// method.
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type Func[T any] func(*T)
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var _ Option[struct{}] = Func[struct{}](nil)
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// Configure implements the [Option] interface.
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func (f Func[T]) Configure(t *T) { f(t) }
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