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Added float types #2

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78 changes: 78 additions & 0 deletions types/float.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,78 @@
package types

import (
"fmt"
"hash/fnv"
"reflect"
"unsafe"
)

type Float64 float64
type Float32 float32

func (self Float32) Equals(other Equatable) bool {
if o, ok := other.(Float32); ok {
return self == o
} else {
return false
}
}

func (self Float32) Less(other Sortable) bool {
if o, ok := other.(Float32); ok {
return self < o
} else {
return false
}
}

func (self Float32) Hash() int {
f := float32(self)
s := &reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(&f)),
Len: 4,
Cap: 4,
}
b := (*[]byte)(unsafe.Pointer(s))
h := fnv.New64a()
_, err := h.Write(*b)
if err != nil {
// should never happen...
panic(fmt.Errorf("could not write to hash %v", err))
}
return int(h.Sum64())
}

func (self Float64) Equals(other Equatable) bool {
if o, ok := other.(Float64); ok {
return self == o
} else {
return false
}
}

func (self Float64) Less(other Sortable) bool {
if o, ok := other.(Float64); ok {
return self < o
} else {
return false
}
}

func (self Float64) Hash() int {
f := float64(self)
s := &reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(&f)),
Len: 8,
Cap: 8,
}
b := (*[]byte)(unsafe.Pointer(s))
h := fnv.New64a()
_, err := h.Write(*b)
if err != nil {
// should never happen...
panic(fmt.Errorf("could not write to hash %v", err))
}
return int(h.Sum64())
}