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options.go
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options.go
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// Copyright 2020 ConsenSys Software Inc.
//
// 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.
// Code generated by consensys/gnark-crypto DO NOT EDIT
package fft
import "runtime"
// Option defines option for altering the behavior of FFT methods.
// See the descriptions of functions returning instances of this type for
// particular options.
type Option func(*fftConfig)
type fftConfig struct {
coset bool
nbTasks int
}
// OnCoset if provided, FFT(a) returns the evaluation of a on a coset.
func OnCoset() Option {
return func(opt *fftConfig) {
opt.coset = true
}
}
// WithNbTasks sets the max number of task (go routine) to spawn. Must be between 1 and 512.
func WithNbTasks(nbTasks int) Option {
if nbTasks < 1 {
nbTasks = 1
} else if nbTasks > 512 {
nbTasks = 512
}
return func(opt *fftConfig) {
opt.nbTasks = nbTasks
}
}
// default options
func options(opts ...Option) fftConfig {
// apply options
opt := fftConfig{
coset: false,
nbTasks: runtime.NumCPU(),
}
for _, option := range opts {
option(&opt)
}
return opt
}