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27 lines
541 B
Go
27 lines
541 B
Go
package profile
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import (
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"log"
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"math/big"
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"time"
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)
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func Duration(invocation time.Time, name string) {
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elapsed := time.Since(invocation)
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log.Printf("%s lasted %s", name, elapsed)
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}
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func BigIntFactorial(x big.Int) *big.Int {
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// Arguments to a defer statement is immediately evaluated and stored.
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// The deferred function receives the pre-evaluated values when its invoked.
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defer Duration(time.Now(), "IntFactorial")
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y := big.NewInt(1)
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for one := big.NewInt(1); x.Sign() > 0; x.Sub(x, one) {
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y.Mul(y, x)
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}
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return x.Set(y)
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}
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