/*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* limitations under the License.
*/
-#ifndef FOLLY_EXCEPTION_H_
-#define FOLLY_EXCEPTION_H_
+#pragma once
#include <errno.h>
//
// The *Explicit functions take an explicit value for errno.
-// Helper to throw std::system_error
-FOLLY_NORETURN void throwSystemErrorExplicit(int err, const char*);
-inline void throwSystemErrorExplicit(int err, const char* msg) {
- throw std::system_error(err, std::system_category(), msg);
+inline std::system_error makeSystemErrorExplicit(int err, const char* msg) {
+ // TODO: The C++ standard indicates that std::generic_category() should be
+ // used for POSIX errno codes.
+ //
+ // We should ideally change this to use std::generic_category() instead of
+ // std::system_category(). However, undertaking this change will require
+ // updating existing call sites that currently catch exceptions thrown by
+ // this code and currently expect std::system_category.
+ return std::system_error(err, std::system_category(), msg);
}
template <class... Args>
-FOLLY_NORETURN void throwSystemErrorExplicit(int, Args&&... args);
-template <class... Args>
-void throwSystemErrorExplicit(int err, Args&&... args) {
- throwSystemErrorExplicit(
+std::system_error makeSystemErrorExplicit(int err, Args&&... args) {
+ return makeSystemErrorExplicit(
err, to<fbstring>(std::forward<Args>(args)...).c_str());
}
-// Helper to throw std::system_error from errno and components of a string
+inline std::system_error makeSystemError(const char* msg) {
+ return makeSystemErrorExplicit(errno, msg);
+}
+
+template <class... Args>
+std::system_error makeSystemError(Args&&... args) {
+ return makeSystemErrorExplicit(errno, std::forward<Args>(args)...);
+}
+
+// Helper to throw std::system_error
+[[noreturn]] inline void throwSystemErrorExplicit(int err, const char* msg) {
+ throw makeSystemErrorExplicit(err, msg);
+}
+
template <class... Args>
-FOLLY_NORETURN void throwSystemError(Args&&... args);
+[[noreturn]] void throwSystemErrorExplicit(int err, Args&&... args) {
+ throw makeSystemErrorExplicit(err, std::forward<Args>(args)...);
+}
+
+// Helper to throw std::system_error from errno and components of a string
template <class... Args>
-void throwSystemError(Args&&... args) {
+[[noreturn]] void throwSystemError(Args&&... args) {
throwSystemErrorExplicit(errno, std::forward<Args>(args)...);
}
template <class... Args>
void checkKernelError(ssize_t ret, Args&&... args) {
if (UNLIKELY(ret < 0)) {
- throwSystemErrorExplicit(-ret, std::forward<Args>(args)...);
+ throwSystemErrorExplicit(int(-ret), std::forward<Args>(args)...);
}
}
}
}
-template <typename E, typename V, typename... Args>
-void throwOnFail(V&& value, Args&&... args) {
- if (!value) {
- throw E(std::forward<Args>(args)...);
- }
-}
-
/**
* If cond is not true, raise an exception of type E. E must have a ctor that
* works with const char* (a description of the failure).
*/
-#define CHECK_THROW(cond, E) \
- ::folly::throwOnFail<E>((cond), "Check failed: " #cond)
-
-} // namespace folly
-
-#endif /* FOLLY_EXCEPTION_H_ */
-
+#define CHECK_THROW(cond, E) \
+ do { \
+ if (!(cond)) { \
+ throw E("Check failed: " #cond); \
+ } \
+ } while (0)
+
+} // namespace folly