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Quelle fallible.h Sprache: C |
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/* 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/. */ #ifndef mozilla_fallible_h #define mozilla_fallible_h #if defined(__cplusplus) /* Explicit fallible allocation * * Memory allocation (normally) defaults to abort in case of failed * allocation. That is, it never returns NULL, and crashes instead. * * Code can explicitely request for fallible memory allocation thanks * to the declarations below. * * The typical use of the mozilla::fallible const is with placement new, * like the following: * * foo = new (mozilla::fallible) Foo(); * * The following forms, or derivatives, are also possible but deprecated: * * foo = new ((mozilla::fallible_t())) Foo(); * * const mozilla::fallible_t f = mozilla::fallible_t(); * bar = new (f) Bar(); * * It is also possible to declare method overloads with fallible allocation * alternatives, like so: * * class Foo { * public: * void Method(void *); * void Method(void *, const mozilla::fallible_t&); * }; * * Foo foo; * foo.Method(nullptr, mozilla::fallible); * * If that last method call is in a method that itself takes a const * fallible_t& argument, it is recommended to propagate that argument * instead of using mozilla::fallible: * * void Func(Foo &foo, const mozilla::fallible_t& aFallible) { * foo.Method(nullptr, aFallible); * } * */ # include <new> namespace mozilla { using fallible_t = std::nothrow_t; static const fallible_t& fallible = std::nothrow; } // namespace mozilla #endif #endif // mozilla_fallible_h
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2026-04-02