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package rand
import (
"crypto/rand"
"fmt"
"io"
"math/big"
)
func init() {
Reader = rand.Reader
}
// Reader provides a random reader that can reset during testing.
var Reader io.Reader
var floatMaxBigInt = big.NewInt(1 << 53)
// Float64 returns a float64 read from an io.Reader source. The returned float will be between [0.0, 1.0).
func Float64(reader io.Reader) (float64, error) {
bi, err := rand.Int(reader, floatMaxBigInt)
if err != nil {
return 0, fmt.Errorf("failed to read random value, %v", err)
}
return float64(bi.Int64()) / (1 << 53), nil
}
// CryptoRandFloat64 returns a random float64 obtained from the crypto rand
// source.
func CryptoRandFloat64() (float64, error) {
return Float64(Reader)
}
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