Added float types

types/float.go

@@ -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())
+}
+