diff options
Diffstat (limited to 'vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go')
| -rw-r--r-- | vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go b/vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go index d95e03aa9..8d718945d 100644 --- a/vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go +++ b/vendor/k8s.io/apimachinery/pkg/api/resource/quantity.go @@ -20,6 +20,7 @@ import ( "bytes" "errors" "fmt" + "math" "math/big" "strconv" "strings" @@ -120,7 +121,7 @@ const ( ) // MustParse turns the given string into a quantity or panics; for tests -// or others cases where you know the string is valid. +// or other cases where you know the string is valid. func MustParse(str string) Quantity { q, err := ParseQuantity(str) if err != nil { @@ -442,6 +443,36 @@ func (q *Quantity) CanonicalizeBytes(out []byte) (result, suffix []byte) { } } +// AsApproximateFloat64 returns a float64 representation of the quantity which may +// lose precision. If the value of the quantity is outside the range of a float64 +// +Inf/-Inf will be returned. +func (q *Quantity) AsApproximateFloat64() float64 { + var base float64 + var exponent int + if q.d.Dec != nil { + base, _ = big.NewFloat(0).SetInt(q.d.Dec.UnscaledBig()).Float64() + exponent = int(-q.d.Dec.Scale()) + } else { + base = float64(q.i.value) + exponent = int(q.i.scale) + } + if exponent == 0 { + return base + } + + // multiply by the appropriate exponential scale + switch q.Format { + case DecimalExponent, DecimalSI: + return base * math.Pow10(exponent) + default: + // fast path for exponents that can fit in 64 bits + if exponent > 0 && exponent < 7 { + return base * float64(int64(1)<<(exponent*10)) + } + return base * math.Pow(2, float64(exponent*10)) + } +} + // AsInt64 returns a representation of the current value as an int64 if a fast conversion // is possible. If false is returned, callers must use the inf.Dec form of this quantity. func (q *Quantity) AsInt64() (int64, bool) { @@ -598,6 +629,9 @@ const int64QuantityExpectedBytes = 18 // String is an expensive operation and caching this result significantly reduces the cost of // normal parse / marshal operations on Quantity. func (q *Quantity) String() string { + if q == nil { + return "<nil>" + } if len(q.s) == 0 { result := make([]byte, 0, int64QuantityExpectedBytes) number, suffix := q.CanonicalizeBytes(result) |