Added {Is,}NaN{,32} methods.

math.go

@@ -0,0 +1,23 @@
+package geom
+
+import "math"
+
+// IsNaN checks if the floating point number is not a number.
+func IsNaN(f float64) bool {
+	return f != f
+}
+
+// IsNaN32 checks if the floating point number is not a number.
+func IsNaN32(f float32) bool {
+	return f != f
+}
+
+// NaN returns not a floating point number.
+func NaN() float64 {
+	return math.NaN()
+}
+
+// NaN32 returns not a floating point  number.
+func NaN32() float32 {
+	return float32(NaN())
+}

math_test.go

@@ -0,0 +1,14 @@
+package geom_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"opslag.de/schobers/geom"
+)
+
+func TestIsNaN32(t *testing.T) {
+	assert.True(t, geom.IsNaN32(geom.NaN32()))
+	assert.False(t, geom.IsNaN32(0))
+	assert.False(t, geom.IsNaN32(-1.43994e8))
+}