[ox] Add file:line error tracing

deps/ox/src/ox/std/error.hpp

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2015 - 2018 gtalent2@gmail.com
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "types.hpp"
+
+#ifdef DEBUG
+#define OxError(x) x ? reinterpret_cast<uint64_t>(__FILE__) | _errorTags(__LINE__, x) : 0
+#else
+#define OxError(x) x
+#endif
+
+namespace ox {
+
+using Error = uint64_t;
+
+constexpr Error errCode(Error err) {
+	return (err >> 58) & onMask<Error>(5);
+}
+
+struct ErrorInfo {
+	const char *file = nullptr;
+	int line = -1;
+	Error errCode = 0;
+
+	ErrorInfo() = default;
+
+	ErrorInfo(Error err) {
+		this->file = reinterpret_cast<const char*>(err & onMask<Error>(48));
+		this->line = static_cast<int>((err >> 48) & onMask<Error>(11));
+		this->errCode = ox::errCode(err);
+	}
+};
+
+static constexpr Error _errorTags(Error line, Error errCode) {
+	line &= onMask<Error>(11);
+	line <<= 48;
+	errCode &= onMask<Error>(5);
+	errCode <<= 59;
+	return errCode | line;
+}
+
+template<typename T>
+struct ValErr {
+	T value;
+	Error error;
+
+	inline constexpr ValErr() = default;
+
+	inline constexpr ValErr(T value, Error error = 0): value(value), error(error) {
+	}
+
+	inline constexpr operator const T&() const {
+		return value;
+	}
+
+	inline constexpr operator T&() {
+		return value;
+	}
+
+	inline constexpr bool ok() const {
+		return error == 0;
+	}
+
+};
+
+}
+