[ox/std] Cleanup some enable_ifs

deps/ox/src/ox/std/byteswap.hpp

@@ -17,19 +17,19 @@ namespace ox {
 
 template<typename T>
 [[nodiscard]]
-constexpr T byteSwap(typename enable_if<sizeof(T) == 1, T>::type i) noexcept {
+constexpr T byteSwap(T const i) noexcept requires(sizeof(T) == 1) {
 	return i;
 }
 
 template<typename T>
 [[nodiscard]]
-constexpr T byteSwap(typename enable_if<sizeof(T) == 2, T>::type i) noexcept {
+constexpr T byteSwap(T const i) noexcept requires(sizeof(T) == 2) {
 	return static_cast<T>(i << 8) | static_cast<T>(i >> 8);
 }
 
 template<typename T>
 [[nodiscard]]
-constexpr T byteSwap(typename enable_if<sizeof(T) == 4, T>::type i) noexcept {
+constexpr T byteSwap(T const i) noexcept requires(sizeof(T) == 4) {
 	return ((i >> 24) & 0x000000ff) |
 	       ((i >>  8) & 0x0000ff00) |
 	       ((i <<  8) & 0x00ff0000) |
@@ -38,7 +38,7 @@ constexpr T byteSwap(typename enable_if<sizeof(T) == 4, T>::type i) noexcept {
 
 template<typename T>
 [[nodiscard]]
-constexpr T byteSwap(typename enable_if<sizeof(T) == 8, T>::type i) noexcept {
+constexpr T byteSwap(T const i) noexcept requires(sizeof(T) == 8) {
 	return ((i >> 56) & 0x00000000000000ff) |
 	       ((i >> 40) & 0x000000000000ff00) |
 	       ((i >> 24) & 0x0000000000ff0000) |

deps/ox/src/ox/std/concepts.hpp

@@ -32,4 +32,8 @@ concept Integral_c = ox::is_integral_v<T>;
 
 template<typename T, size_t max>
 concept IntegerRange_c = ox::is_integer_v<T> && ox::MaxValue<T> >= max;
+
+template<typename Union>
+concept Union_c = is_union_v<Union>;
+
 }

deps/ox/src/ox/std/strconv.hpp

@@ -32,7 +32,7 @@ constexpr ox::Error writeItoa(Integer v, ox::Writer_c auto &writer) noexcept {
 			val %= mod;
 			mod /= base;
 			if (it || digit) {
-				ox::ResizedInt_t<Integer, 64> start = '0';
+				constexpr auto start = '0';
 				if (digit >= 10) [[unlikely]] {
 					digit -= 10;
 					OX_RETURN_ERROR(writer.put('1'));