getopt: init module

getopt/float.go

@@ -0,0 +1,33 @@
+package getopt
+
+import (
+	"fmt"
+)
+
+type floatVal float64
+
+func (f *floatVal) String() string {
+	return fmt.Sprint(float64(*f))
+}
+
+func (f *floatVal) Set(val string) error {
+	_, err := fmt.Sscanf(val, "%g", f)
+	return err
+}
+
+// Float64Var defines a float64 flag with specified name, default value,
+// and usage string. The argument p points to a float64 variable in
+// which to store the value of the flag.
+func (set *FlagSet) Float64Var(p *float64, name string, value float64, usage string) {
+	*p = value
+	set.Var((*floatVal)(p), name, usage)
+}
+
+// Float64 defines a float64 flag with specified name, default value,
+// and usage string. The return value is the address of a float64
+// variable that stores the value of the flag.
+func (set *FlagSet) Float64(name string, value float64, usage string) *float64 {
+	var f float64
+	set.Float64Var(&f, name, value, usage)
+	return &f
+}