Add float utilities, & float formatting with dragonbox

asl/float.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "asl/meta.hpp"
+
+namespace asl
+{
+
+template<is_floating_point T> constexpr T infinity() { return __builtin_inf(); }
+
+template<is_floating_point T> constexpr T nan() { return static_cast<T>(__builtin_nanf("")); }
+
+template<is_floating_point T> constexpr bool is_infinity(T f) { return __builtin_isinf(f); }
+
+template<is_floating_point T> constexpr bool is_nan(T f) { return __builtin_isnan(f); }
+
+} // namespace asl
+