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| 1 | //===-- Self contained functional header ------------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_LIBC_SRC___SUPPORT_CPP_FUNCTIONAL_H |
| 10 | #define LLVM_LIBC_SRC___SUPPORT_CPP_FUNCTIONAL_H |
| 11 | |
| 12 | #include "src/__support/CPP/type_traits/enable_if.h" |
| 13 | #include "src/__support/CPP/type_traits/is_convertible.h" |
| 14 | #include "src/__support/CPP/type_traits/is_same.h" |
| 15 | #include "src/__support/CPP/type_traits/is_void.h" |
| 16 | #include "src/__support/CPP/type_traits/remove_cvref.h" |
| 17 | #include "src/__support/CPP/type_traits/remove_reference.h" |
| 18 | #include "src/__support/CPP/utility/forward.h" |
| 19 | #include "src/__support/macros/attributes.h" |
| 20 | #include "src/__support/macros/config.h" |
| 21 | |
| 22 | #include <stdint.h> |
| 23 | |
| 24 | namespace LIBC_NAMESPACE_DECL { |
| 25 | namespace cpp { |
| 26 | |
| 27 | /// A function type adapted from LLVM's function_ref. |
| 28 | /// This class does not own the callable, so it is not in general safe to |
| 29 | /// store a function. |
| 30 | template <typename Fn> class function; |
| 31 | |
| 32 | template <typename Ret, typename... Params> class function<Ret(Params...)> { |
| 33 | Ret (*callback)(intptr_t callable, Params... params) = nullptr; |
| 34 | intptr_t callable; |
| 35 | |
| 36 | template <typename Callable> |
| 37 | LIBC_INLINE static Ret callback_fn(intptr_t callable, Params... params) { |
| 38 | return (*reinterpret_cast<Callable *>(callable))( |
| 39 | cpp::forward<Params>(params)...); |
| 40 | } |
| 41 | |
| 42 | public: |
| 43 | LIBC_INLINE function() = default; |
| 44 | LIBC_INLINE function(decltype(nullptr)) {} |
| 45 | LIBC_INLINE ~function() = default; |
| 46 | |
| 47 | template <typename Callable> |
| 48 | LIBC_INLINE function( |
| 49 | Callable &&callable, |
| 50 | // This is not the copy-constructor. |
| 51 | enable_if_t<!cpp::is_same_v<remove_cvref_t<Callable>, function>> * = |
| 52 | nullptr, |
| 53 | // Functor must be callable and return a suitable type. |
| 54 | enable_if_t<cpp::is_void_v<Ret> || |
| 55 | cpp::is_convertible_v< |
| 56 | decltype(declval<Callable>()(declval<Params>()...)), Ret>> |
| 57 | * = nullptr) |
| 58 | : callback(callback_fn<cpp::remove_reference_t<Callable>>), |
| 59 | callable(reinterpret_cast<intptr_t>(&callable)) {} |
| 60 | |
| 61 | LIBC_INLINE Ret operator()(Params... params) const { |
| 62 | return callback(callable, cpp::forward<Params>(params)...); |
| 63 | } |
| 64 | |
| 65 | LIBC_INLINE explicit operator bool() const { return callback; } |
| 66 | }; |
| 67 | |
| 68 | } // namespace cpp |
| 69 | } // namespace LIBC_NAMESPACE_DECL |
| 70 | |
| 71 | #endif // LLVM_LIBC_SRC___SUPPORT_CPP_FUNCTIONAL_H |
| 72 |
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