Add ToXXXOrNil functions.

Author: AlekSi

pointer_or_nil.go

@@ -0,0 +1,189 @@
+package pointer
+
+import (
+	"time"
+)
+
+/*
+Order as in spec:
+	bool byte complex64 complex128 error float32 float64
+	int int8 int16 int32 int64 rune string
+	uint uint8 uint16 uint32 uint64 uintptr
+	time.Duration time.Time
+*/
+
+// ToBoolOrNil returns a pointer to the passed bool value, or nil, if passed value is a zero value.
+func ToBoolOrNil(b bool) *bool {
+	if b == false {
+		return nil
+	}
+	return &b
+}
+
+// ToByteOrNil returns a pointer to the passed byte value, or nil, if passed value is a zero value.
+func ToByteOrNil(b byte) *byte {
+	if b == 0 {
+		return nil
+	}
+	return &b
+}
+
+// ToComplex64OrNil returns a pointer to the passed complex64 value, or nil, if passed value is a zero value.
+func ToComplex64OrNil(c complex64) *complex64 {
+	if c == 0 {
+		return nil
+	}
+	return &c
+}
+
+// ToComplex128OrNil returns a pointer to the passed complex128 value, or nil, if passed value is a zero value.
+func ToComplex128OrNil(c complex128) *complex128 {
+	if c == 0 {
+		return nil
+	}
+	return &c
+}
+
+// ToErrorOrNil returns a pointer to the passed error value, or nil, if passed value is a zero value.
+func ToErrorOrNil(e error) *error {
+	if e == nil {
+		return nil
+	}
+	return &e
+}
+
+// ToFloat32OrNil returns a pointer to the passed float32 value, or nil, if passed value is a zero value.
+func ToFloat32OrNil(f float32) *float32 {
+	if f == 0 {
+		return nil
+	}
+	return &f
+}
+
+// ToFloat64OrNil returns a pointer to the passed float64 value, or nil, if passed value is a zero value.
+func ToFloat64OrNil(f float64) *float64 {
+	if f == 0 {
+		return nil
+	}
+	return &f
+}
+
+// ToIntOrNil returns a pointer to the passed int value, or nil, if passed value is a zero value.
+func ToIntOrNil(i int) *int {
+	if i == 0 {
+		return nil
+	}
+	return &i
+}
+
+// ToInt8OrNil returns a pointer to the passed int8 value, or nil, if passed value is a zero value.
+func ToInt8OrNil(i int8) *int8 {
+	if i == 0 {
+		return nil
+	}
+	return &i
+}
+
+// ToInt16OrNil returns a pointer to the passed int16 value, or nil, if passed value is a zero value.
+func ToInt16OrNil(i int16) *int16 {
+	if i == 0 {
+		return nil
+	}
+	return &i
+}
+
+// ToInt32OrNil returns a pointer to the passed int32 value, or nil, if passed value is a zero value.
+func ToInt32OrNil(i int32) *int32 {
+	if i == 0 {
+		return nil
+	}
+	return &i
+}
+
+// ToInt64OrNil returns a pointer to the passed int64 value, or nil, if passed value is a zero value.
+func ToInt64OrNil(i int64) *int64 {
+	if i == 0 {
+		return nil
+	}
+	return &i
+}
+
+// ToRuneOrNil returns a pointer to the passed rune value, or nil, if passed value is a zero value.
+func ToRuneOrNil(r rune) *rune {
+	if r == 0 {
+		return nil
+	}
+	return &r
+}
+
+// ToStringOrNil returns a pointer to the passed string value, or nil, if passed value is a zero value.
+func ToStringOrNil(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}
+
+// ToUintOrNil returns a pointer to the passed uint value, or nil, if passed value is a zero value.
+func ToUintOrNil(u uint) *uint {
+	if u == 0 {
+		return nil
+	}
+	return &u
+}
+
+// ToUint8OrNil returns a pointer to the passed uint8 value, or nil, if passed value is a zero value.
+func ToUint8OrNil(u uint8) *uint8 {
+	if u == 0 {
+		return nil
+	}
+	return &u
+}
+
+// ToUint16OrNil returns a pointer to the passed uint16 value, or nil, if passed value is a zero value.
+func ToUint16OrNil(u uint16) *uint16 {
+	if u == 0 {
+		return nil
+	}
+	return &u
+}
+
+// ToUint32OrNil returns a pointer to the passed uint32 value, or nil, if passed value is a zero value.
+func ToUint32OrNil(u uint32) *uint32 {
+	if u == 0 {
+		return nil
+	}
+	return &u
+}
+
+// ToUint64OrNil returns a pointer to the passed uint64 value, or nil, if passed value is a zero value.
+func ToUint64OrNil(u uint64) *uint64 {
+	if u == 0 {
+		return nil
+	}
+	return &u
+}
+
+// ToUintptrOrNil returns a pointer to the passed uintptr value, or nil, if passed value is a zero value.
+func ToUintptrOrNil(u uintptr) *uintptr {
+	if u == 0 {
+		return nil
+	}
+	return &u
+}
+
+// ToDurationOrNil returns a pointer to the passed time.Duration value, or nil, if passed value is a zero value.
+func ToDurationOrNil(d time.Duration) *time.Duration {
+	if d == 0 {
+		return nil
+	}
+	return &d
+}
+
+// ToTimeOrNil returns a pointer to the passed time.Time value, or nil, if passed value is a zero value (t.IsZero() returns true).
+func ToTimeOrNil(t time.Time) *time.Time {
+	if t.IsZero() {
+		return nil
+	}
+	return &t
+}