2050d2e181
Since we've removed allocator support, we can remove a few support structures. This only affects the policy implementation, so this shouldn't even be ABI sensitive.
832 lines
26 KiB
C++
832 lines
26 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___FUNCTIONAL_FUNCTION_H
|
|
#define _LIBCPP___FUNCTIONAL_FUNCTION_H
|
|
|
|
#include <__assert>
|
|
#include <__config>
|
|
#include <__cstddef/nullptr_t.h>
|
|
#include <__exception/exception.h>
|
|
#include <__functional/binary_function.h>
|
|
#include <__functional/invoke.h>
|
|
#include <__functional/unary_function.h>
|
|
#include <__memory/addressof.h>
|
|
#include <__type_traits/aligned_storage.h>
|
|
#include <__type_traits/decay.h>
|
|
#include <__type_traits/is_core_convertible.h>
|
|
#include <__type_traits/is_scalar.h>
|
|
#include <__type_traits/is_trivially_constructible.h>
|
|
#include <__type_traits/is_trivially_destructible.h>
|
|
#include <__type_traits/is_void.h>
|
|
#include <__type_traits/strip_signature.h>
|
|
#include <__utility/forward.h>
|
|
#include <__utility/move.h>
|
|
#include <__utility/swap.h>
|
|
#include <tuple>
|
|
#include <typeinfo>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
# pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
// bad_function_call
|
|
|
|
_LIBCPP_DIAGNOSTIC_PUSH
|
|
# if !_LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_KEY_FUNCTION
|
|
_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")
|
|
# endif
|
|
class _LIBCPP_EXPORTED_FROM_ABI bad_function_call : public exception {
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI bad_function_call() _NOEXCEPT = default;
|
|
_LIBCPP_HIDE_FROM_ABI bad_function_call(const bad_function_call&) _NOEXCEPT = default;
|
|
_LIBCPP_HIDE_FROM_ABI bad_function_call& operator=(const bad_function_call&) _NOEXCEPT = default;
|
|
// Note that when a key function is not used, every translation unit that uses
|
|
// bad_function_call will end up containing a weak definition of the vtable and
|
|
// typeinfo.
|
|
# if _LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_KEY_FUNCTION
|
|
~bad_function_call() _NOEXCEPT override;
|
|
# else
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL ~bad_function_call() _NOEXCEPT override {}
|
|
# endif
|
|
|
|
# if _LIBCPP_AVAILABILITY_HAS_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
|
|
const char* what() const _NOEXCEPT override;
|
|
# endif
|
|
};
|
|
_LIBCPP_DIAGNOSTIC_POP
|
|
|
|
[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_function_call() {
|
|
# if _LIBCPP_HAS_EXCEPTIONS
|
|
throw bad_function_call();
|
|
# else
|
|
_LIBCPP_VERBOSE_ABORT("bad_function_call was thrown in -fno-exceptions mode");
|
|
# endif
|
|
}
|
|
|
|
template <class _Fp>
|
|
class function; // undefined
|
|
|
|
namespace __function {
|
|
|
|
template <class _Rp>
|
|
struct __maybe_derive_from_unary_function {};
|
|
|
|
template <class _Rp, class _A1>
|
|
struct __maybe_derive_from_unary_function<_Rp(_A1)> : public __unary_function<_A1, _Rp> {};
|
|
|
|
template <class _Rp>
|
|
struct __maybe_derive_from_binary_function {};
|
|
|
|
template <class _Rp, class _A1, class _A2>
|
|
struct __maybe_derive_from_binary_function<_Rp(_A1, _A2)> : public __binary_function<_A1, _A2, _Rp> {};
|
|
|
|
template <class _Fp>
|
|
_LIBCPP_HIDE_FROM_ABI bool __not_null(_Fp const&) {
|
|
return true;
|
|
}
|
|
|
|
template <class _Fp>
|
|
_LIBCPP_HIDE_FROM_ABI bool __not_null(_Fp* __ptr) {
|
|
return __ptr;
|
|
}
|
|
|
|
template <class _Ret, class _Class>
|
|
_LIBCPP_HIDE_FROM_ABI bool __not_null(_Ret _Class::*__ptr) {
|
|
return __ptr;
|
|
}
|
|
|
|
template <class _Fp>
|
|
_LIBCPP_HIDE_FROM_ABI bool __not_null(function<_Fp> const& __f) {
|
|
return !!__f;
|
|
}
|
|
|
|
# if __has_extension(blocks)
|
|
template <class _Rp, class... _Args>
|
|
_LIBCPP_HIDE_FROM_ABI bool __not_null(_Rp (^__p)(_Args...)) {
|
|
return __p;
|
|
}
|
|
# endif
|
|
|
|
} // namespace __function
|
|
|
|
namespace __function {
|
|
|
|
// __base provides an abstract interface for copyable functors.
|
|
|
|
template <class _Fp>
|
|
class __base;
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
class __base<_Rp(_ArgTypes...)> {
|
|
public:
|
|
__base(const __base&) = delete;
|
|
__base& operator=(const __base&) = delete;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __base() {}
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual ~__base() {}
|
|
virtual __base* __clone() const = 0;
|
|
virtual void __clone(__base*) const = 0;
|
|
virtual void destroy() _NOEXCEPT = 0;
|
|
virtual void destroy_deallocate() _NOEXCEPT = 0;
|
|
virtual _Rp operator()(_ArgTypes&&...) = 0;
|
|
# if _LIBCPP_HAS_RTTI
|
|
virtual const void* target(const type_info&) const _NOEXCEPT = 0;
|
|
virtual const std::type_info& target_type() const _NOEXCEPT = 0;
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
};
|
|
|
|
// __func implements __base for a given functor type.
|
|
|
|
template <class _FD, class _FB>
|
|
class __func;
|
|
|
|
template <class _Fp, class _Rp, class... _ArgTypes>
|
|
class __func<_Fp, _Rp(_ArgTypes...)> : public __base<_Rp(_ArgTypes...)> {
|
|
_Fp __func_;
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI explicit __func(_Fp&& __f) : __func_(std::move(__f)) {}
|
|
_LIBCPP_HIDE_FROM_ABI explicit __func(const _Fp& __f) : __func_(__f) {}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL __base<_Rp(_ArgTypes...)>* __clone() const override { return new __func(__func_); }
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL void __clone(__base<_Rp(_ArgTypes...)>* __p) const override {
|
|
::new ((void*)__p) __func(__func_);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL void destroy() _NOEXCEPT override { __func_.~_Fp(); }
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL void destroy_deallocate() _NOEXCEPT override { delete this; }
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL _Rp operator()(_ArgTypes&&... __arg) override {
|
|
return std::__invoke_r<_Rp>(__func_, std::forward<_ArgTypes>(__arg)...);
|
|
}
|
|
# if _LIBCPP_HAS_RTTI
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL const void* target(const type_info& __ti) const _NOEXCEPT override {
|
|
if (__ti == typeid(_Fp))
|
|
return std::addressof(__func_);
|
|
return nullptr;
|
|
}
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL const std::type_info& target_type() const _NOEXCEPT override { return typeid(_Fp); }
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
};
|
|
|
|
// __value_func creates a value-type from a __func.
|
|
|
|
template <class _Fp>
|
|
class __value_func;
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
class __value_func<_Rp(_ArgTypes...)> {
|
|
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
|
|
typename aligned_storage<3 * sizeof(void*)>::type __buf_;
|
|
_LIBCPP_SUPPRESS_DEPRECATED_POP
|
|
|
|
typedef __base<_Rp(_ArgTypes...)> __func;
|
|
__func* __f_;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI static __func* __as_base(void* __p) { return reinterpret_cast<__func*>(__p); }
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI __value_func() _NOEXCEPT : __f_(nullptr) {}
|
|
|
|
template <class _Fp, __enable_if_t<!is_same<__decay_t<_Fp>, __value_func>::value, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI explicit __value_func(_Fp&& __f) : __f_(nullptr) {
|
|
typedef __function::__func<_Fp, _Rp(_ArgTypes...)> _Fun;
|
|
|
|
if (__function::__not_null(__f)) {
|
|
if (sizeof(_Fun) <= sizeof(__buf_) && is_nothrow_copy_constructible<_Fp>::value) {
|
|
__f_ = ::new (std::addressof(__buf_)) _Fun(std::move(__f));
|
|
} else {
|
|
__f_ = new _Fun(std::move(__f));
|
|
}
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __value_func(const __value_func& __f) {
|
|
if (__f.__f_ == nullptr)
|
|
__f_ = nullptr;
|
|
else if ((void*)__f.__f_ == &__f.__buf_) {
|
|
__f_ = __as_base(&__buf_);
|
|
__f.__f_->__clone(__f_);
|
|
} else
|
|
__f_ = __f.__f_->__clone();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __value_func(__value_func&& __f) _NOEXCEPT {
|
|
if (__f.__f_ == nullptr)
|
|
__f_ = nullptr;
|
|
else if ((void*)__f.__f_ == &__f.__buf_) {
|
|
__f_ = __as_base(&__buf_);
|
|
__f.__f_->__clone(__f_);
|
|
} else {
|
|
__f_ = __f.__f_;
|
|
__f.__f_ = nullptr;
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI ~__value_func() {
|
|
if ((void*)__f_ == &__buf_)
|
|
__f_->destroy();
|
|
else if (__f_)
|
|
__f_->destroy_deallocate();
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __value_func& operator=(__value_func&& __f) {
|
|
*this = nullptr;
|
|
if (__f.__f_ == nullptr)
|
|
__f_ = nullptr;
|
|
else if ((void*)__f.__f_ == &__f.__buf_) {
|
|
__f_ = __as_base(&__buf_);
|
|
__f.__f_->__clone(__f_);
|
|
} else {
|
|
__f_ = __f.__f_;
|
|
__f.__f_ = nullptr;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __value_func& operator=(nullptr_t) {
|
|
__func* __f = __f_;
|
|
__f_ = nullptr;
|
|
if ((void*)__f == &__buf_)
|
|
__f->destroy();
|
|
else if (__f)
|
|
__f->destroy_deallocate();
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _Rp operator()(_ArgTypes&&... __args) const {
|
|
if (__f_ == nullptr)
|
|
std::__throw_bad_function_call();
|
|
return (*__f_)(std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI void swap(__value_func& __f) _NOEXCEPT {
|
|
if (std::addressof(__f) == this)
|
|
return;
|
|
if ((void*)__f_ == &__buf_ && (void*)__f.__f_ == &__f.__buf_) {
|
|
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
|
|
typename aligned_storage<sizeof(__buf_)>::type __tempbuf;
|
|
_LIBCPP_SUPPRESS_DEPRECATED_POP
|
|
__func* __t = __as_base(&__tempbuf);
|
|
__f_->__clone(__t);
|
|
__f_->destroy();
|
|
__f_ = nullptr;
|
|
__f.__f_->__clone(__as_base(&__buf_));
|
|
__f.__f_->destroy();
|
|
__f.__f_ = nullptr;
|
|
__f_ = __as_base(&__buf_);
|
|
__t->__clone(__as_base(&__f.__buf_));
|
|
__t->destroy();
|
|
__f.__f_ = __as_base(&__f.__buf_);
|
|
} else if ((void*)__f_ == &__buf_) {
|
|
__f_->__clone(__as_base(&__f.__buf_));
|
|
__f_->destroy();
|
|
__f_ = __f.__f_;
|
|
__f.__f_ = __as_base(&__f.__buf_);
|
|
} else if ((void*)__f.__f_ == &__f.__buf_) {
|
|
__f.__f_->__clone(__as_base(&__buf_));
|
|
__f.__f_->destroy();
|
|
__f.__f_ = __f_;
|
|
__f_ = __as_base(&__buf_);
|
|
} else
|
|
std::swap(__f_, __f.__f_);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __f_ != nullptr; }
|
|
|
|
# if _LIBCPP_HAS_RTTI
|
|
_LIBCPP_HIDE_FROM_ABI const std::type_info& target_type() const _NOEXCEPT {
|
|
if (__f_ == nullptr)
|
|
return typeid(void);
|
|
return __f_->target_type();
|
|
}
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI const _Tp* target() const _NOEXCEPT {
|
|
if (__f_ == nullptr)
|
|
return nullptr;
|
|
return (const _Tp*)__f_->target(typeid(_Tp));
|
|
}
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
};
|
|
|
|
// Storage for a functor object, to be used with __policy to manage copy and
|
|
// destruction.
|
|
union __policy_storage {
|
|
mutable char __small[sizeof(void*) * 2];
|
|
void* __large;
|
|
};
|
|
|
|
// True if _Fun can safely be held in __policy_storage.__small.
|
|
template <typename _Fun>
|
|
struct __use_small_storage
|
|
: public integral_constant<
|
|
bool,
|
|
sizeof(_Fun) <= sizeof(__policy_storage)&& _LIBCPP_ALIGNOF(_Fun) <= _LIBCPP_ALIGNOF(__policy_storage) &&
|
|
is_trivially_copy_constructible<_Fun>::value && is_trivially_destructible<_Fun>::value> {};
|
|
|
|
// Policy contains information about how to copy, destroy, and move the
|
|
// underlying functor. You can think of it as a vtable of sorts.
|
|
struct __policy {
|
|
// Used to copy or destroy __large values. null for trivial objects.
|
|
void* (*const __clone)(const void*);
|
|
void (*const __destroy)(void*);
|
|
|
|
// True if this is the null policy (no value).
|
|
const bool __is_null;
|
|
|
|
// The target type. May be null if RTTI is disabled.
|
|
const std::type_info* const __type_info;
|
|
|
|
// Returns a pointer to a static policy object suitable for the functor
|
|
// type.
|
|
template <typename _Fun>
|
|
_LIBCPP_HIDE_FROM_ABI static const __policy* __create() {
|
|
return __choose_policy<_Fun>(__use_small_storage<_Fun>());
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static const __policy* __create_empty() {
|
|
static constexpr __policy __policy = {
|
|
nullptr,
|
|
nullptr,
|
|
true,
|
|
# if _LIBCPP_HAS_RTTI
|
|
&typeid(void)
|
|
# else
|
|
nullptr
|
|
# endif
|
|
};
|
|
return &__policy;
|
|
}
|
|
|
|
private:
|
|
template <typename _Fun>
|
|
_LIBCPP_HIDE_FROM_ABI static void* __large_clone(const void* __s) {
|
|
const _Fun* __f = static_cast<const _Fun*>(__s);
|
|
return new _Fun(*__f);
|
|
}
|
|
|
|
template <typename _Fun>
|
|
_LIBCPP_HIDE_FROM_ABI static void __large_destroy(void* __s) {
|
|
delete static_cast<_Fun*>(__s);
|
|
}
|
|
|
|
template <typename _Fun>
|
|
_LIBCPP_HIDE_FROM_ABI static const __policy* __choose_policy(/* is_small = */ false_type) {
|
|
static constexpr __policy __policy = {
|
|
std::addressof(__large_clone<_Fun>),
|
|
std::addressof(__large_destroy<_Fun>),
|
|
false,
|
|
# if _LIBCPP_HAS_RTTI
|
|
&typeid(_Fun)
|
|
# else
|
|
nullptr
|
|
# endif
|
|
};
|
|
return &__policy;
|
|
}
|
|
|
|
template <typename _Fun>
|
|
_LIBCPP_HIDE_FROM_ABI static const __policy* __choose_policy(/* is_small = */ true_type) {
|
|
static constexpr __policy __policy = {
|
|
nullptr,
|
|
nullptr,
|
|
false,
|
|
# if _LIBCPP_HAS_RTTI
|
|
&typeid(_Fun)
|
|
# else
|
|
nullptr
|
|
# endif
|
|
};
|
|
return &__policy;
|
|
}
|
|
};
|
|
|
|
// Used to choose between perfect forwarding or pass-by-value. Pass-by-value is
|
|
// faster for types that can be passed in registers.
|
|
template <typename _Tp>
|
|
using __fast_forward _LIBCPP_NODEBUG = __conditional_t<is_scalar<_Tp>::value, _Tp, _Tp&&>;
|
|
|
|
// __policy_func uses a __policy to create a type-erased, copyable functor.
|
|
|
|
template <class _Fp>
|
|
class __policy_func;
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
class __policy_func<_Rp(_ArgTypes...)> {
|
|
// Inline storage for small objects.
|
|
__policy_storage __buf_;
|
|
|
|
using _ErasedFunc _LIBCPP_NODEBUG = _Rp(const __policy_storage*, __fast_forward<_ArgTypes>...);
|
|
|
|
_ErasedFunc* __func_;
|
|
|
|
// The policy that describes how to move / copy / destroy __buf_. Never
|
|
// null, even if the function is empty.
|
|
const __policy* __policy_;
|
|
|
|
_LIBCPP_HIDE_FROM_ABI static _Rp __empty_func(const __policy_storage*, __fast_forward<_ArgTypes>...) {
|
|
std::__throw_bad_function_call();
|
|
}
|
|
|
|
template <class _Fun>
|
|
_LIBCPP_HIDE_FROM_ABI static _Rp __call_func(const __policy_storage* __buf, __fast_forward<_ArgTypes>... __args) {
|
|
_Fun* __func = reinterpret_cast<_Fun*>(__use_small_storage<_Fun>::value ? &__buf->__small : __buf->__large);
|
|
|
|
return std::__invoke_r<_Rp>(*__func, std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI __policy_func() : __func_(__empty_func), __policy_(__policy::__create_empty()) {}
|
|
|
|
template <class _Fp, __enable_if_t<!is_same<__decay_t<_Fp>, __policy_func>::value, int> = 0>
|
|
_LIBCPP_HIDE_FROM_ABI explicit __policy_func(_Fp&& __f) : __policy_(__policy::__create_empty()) {
|
|
if (__function::__not_null(__f)) {
|
|
__func_ = __call_func<_Fp>;
|
|
__policy_ = __policy::__create<_Fp>();
|
|
if (__use_small_storage<_Fp>()) {
|
|
::new ((void*)&__buf_.__small) _Fp(std::move(__f));
|
|
} else {
|
|
__buf_.__large = ::new _Fp(std::move(__f));
|
|
}
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __policy_func(const __policy_func& __f)
|
|
: __buf_(__f.__buf_), __func_(__f.__func_), __policy_(__f.__policy_) {
|
|
if (__policy_->__clone)
|
|
__buf_.__large = __policy_->__clone(__f.__buf_.__large);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __policy_func(__policy_func&& __f)
|
|
: __buf_(__f.__buf_), __func_(__f.__func_), __policy_(__f.__policy_) {
|
|
if (__policy_->__destroy) {
|
|
__f.__policy_ = __policy::__create_empty();
|
|
__f.__func_ = {};
|
|
}
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI ~__policy_func() {
|
|
if (__policy_->__destroy)
|
|
__policy_->__destroy(__buf_.__large);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __policy_func& operator=(__policy_func&& __f) {
|
|
*this = nullptr;
|
|
__buf_ = __f.__buf_;
|
|
__func_ = __f.__func_;
|
|
__policy_ = __f.__policy_;
|
|
__f.__policy_ = __policy::__create_empty();
|
|
__f.__func_ = {};
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI __policy_func& operator=(nullptr_t) {
|
|
const __policy* __p = __policy_;
|
|
__policy_ = __policy::__create_empty();
|
|
__func_ = {};
|
|
if (__p->__destroy)
|
|
__p->__destroy(__buf_.__large);
|
|
return *this;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI _Rp operator()(_ArgTypes&&... __args) const {
|
|
return __func_(std::addressof(__buf_), std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI void swap(__policy_func& __f) {
|
|
std::swap(__func_, __f.__func_);
|
|
std::swap(__policy_, __f.__policy_);
|
|
std::swap(__buf_, __f.__buf_);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return !__policy_->__is_null; }
|
|
|
|
# if _LIBCPP_HAS_RTTI
|
|
_LIBCPP_HIDE_FROM_ABI const std::type_info& target_type() const _NOEXCEPT { return *__policy_->__type_info; }
|
|
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI const _Tp* target() const _NOEXCEPT {
|
|
if (__policy_->__is_null || typeid(_Tp) != *__policy_->__type_info)
|
|
return nullptr;
|
|
if (__policy_->__clone) // Out of line storage.
|
|
return reinterpret_cast<const _Tp*>(__buf_.__large);
|
|
else
|
|
return reinterpret_cast<const _Tp*>(&__buf_.__small);
|
|
}
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
};
|
|
|
|
# if _LIBCPP_HAS_BLOCKS_RUNTIME
|
|
|
|
extern "C" void* _Block_copy(const void*);
|
|
extern "C" void _Block_release(const void*);
|
|
|
|
template <class _Rp1, class... _ArgTypes1, class _Rp, class... _ArgTypes>
|
|
class __func<_Rp1 (^)(_ArgTypes1...), _Rp(_ArgTypes...)> : public __base<_Rp(_ArgTypes...)> {
|
|
typedef _Rp1 (^__block_type)(_ArgTypes1...);
|
|
__block_type __f_;
|
|
|
|
public:
|
|
_LIBCPP_HIDE_FROM_ABI explicit __func(__block_type const& __f)
|
|
# if __has_feature(objc_arc)
|
|
: __f_(__f)
|
|
# else
|
|
: __f_(reinterpret_cast<__block_type>(__f ? _Block_copy(__f) : nullptr))
|
|
# endif
|
|
{
|
|
}
|
|
|
|
// [TODO] add && to save on a retain
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual __base<_Rp(_ArgTypes...)>* __clone() const {
|
|
_LIBCPP_ASSERT_INTERNAL(
|
|
false,
|
|
"Block pointers are just pointers, so they should always fit into "
|
|
"std::function's small buffer optimization. This function should "
|
|
"never be invoked.");
|
|
return nullptr;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual void __clone(__base<_Rp(_ArgTypes...)>* __p) const {
|
|
::new ((void*)__p) __func(__f_);
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual void destroy() _NOEXCEPT {
|
|
# if !__has_feature(objc_arc)
|
|
if (__f_)
|
|
_Block_release(__f_);
|
|
# endif
|
|
__f_ = 0;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual void destroy_deallocate() _NOEXCEPT {
|
|
_LIBCPP_ASSERT_INTERNAL(
|
|
false,
|
|
"Block pointers are just pointers, so they should always fit into "
|
|
"std::function's small buffer optimization. This function should "
|
|
"never be invoked.");
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual _Rp operator()(_ArgTypes&&... __arg) {
|
|
return std::__invoke(__f_, std::forward<_ArgTypes>(__arg)...);
|
|
}
|
|
|
|
# if _LIBCPP_HAS_RTTI
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual const void* target(type_info const& __ti) const _NOEXCEPT {
|
|
if (__ti == typeid(__func::__block_type))
|
|
return &__f_;
|
|
return (const void*)nullptr;
|
|
}
|
|
|
|
_LIBCPP_HIDE_FROM_ABI_VIRTUAL virtual const std::type_info& target_type() const _NOEXCEPT {
|
|
return typeid(__func::__block_type);
|
|
}
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
};
|
|
|
|
# endif // _LIBCPP_HAS_BLOCKS_RUNTIME
|
|
|
|
} // namespace __function
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
class function<_Rp(_ArgTypes...)>
|
|
: public __function::__maybe_derive_from_unary_function<_Rp(_ArgTypes...)>,
|
|
public __function::__maybe_derive_from_binary_function<_Rp(_ArgTypes...)> {
|
|
# ifndef _LIBCPP_ABI_OPTIMIZED_FUNCTION
|
|
typedef __function::__value_func<_Rp(_ArgTypes...)> __func;
|
|
# else
|
|
typedef __function::__policy_func<_Rp(_ArgTypes...)> __func;
|
|
# endif
|
|
|
|
__func __f_;
|
|
|
|
template <class _Fp,
|
|
bool = _And<_IsNotSame<__remove_cvref_t<_Fp>, function>, __is_invocable<_Fp, _ArgTypes...> >::value>
|
|
struct __callable;
|
|
template <class _Fp>
|
|
struct __callable<_Fp, true> {
|
|
static const bool value =
|
|
is_void<_Rp>::value || __is_core_convertible<__invoke_result_t<_Fp, _ArgTypes...>, _Rp>::value;
|
|
};
|
|
template <class _Fp>
|
|
struct __callable<_Fp, false> {
|
|
static const bool value = false;
|
|
};
|
|
|
|
template <class _Fp>
|
|
using _EnableIfLValueCallable _LIBCPP_NODEBUG = __enable_if_t<__callable<_Fp&>::value>;
|
|
|
|
public:
|
|
typedef _Rp result_type;
|
|
|
|
// construct/copy/destroy:
|
|
_LIBCPP_HIDE_FROM_ABI function() _NOEXCEPT {}
|
|
_LIBCPP_HIDE_FROM_ABI function(nullptr_t) _NOEXCEPT {}
|
|
_LIBCPP_HIDE_FROM_ABI function(const function&);
|
|
_LIBCPP_HIDE_FROM_ABI function(function&&) _NOEXCEPT;
|
|
template <class _Fp, class = _EnableIfLValueCallable<_Fp>>
|
|
_LIBCPP_HIDE_FROM_ABI function(_Fp);
|
|
|
|
# if _LIBCPP_STD_VER <= 14
|
|
template <class _Alloc>
|
|
_LIBCPP_HIDE_FROM_ABI function(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
|
|
template <class _Alloc>
|
|
_LIBCPP_HIDE_FROM_ABI function(allocator_arg_t, const _Alloc&, nullptr_t) _NOEXCEPT {}
|
|
template <class _Alloc>
|
|
_LIBCPP_HIDE_FROM_ABI function(allocator_arg_t, const _Alloc&, const function&);
|
|
template <class _Alloc>
|
|
_LIBCPP_HIDE_FROM_ABI function(allocator_arg_t, const _Alloc&, function&&);
|
|
template <class _Fp, class _Alloc, class = _EnableIfLValueCallable<_Fp>>
|
|
_LIBCPP_HIDE_FROM_ABI function(allocator_arg_t, const _Alloc& __a, _Fp __f);
|
|
# endif
|
|
|
|
_LIBCPP_HIDE_FROM_ABI function& operator=(const function&);
|
|
_LIBCPP_HIDE_FROM_ABI function& operator=(function&&) _NOEXCEPT;
|
|
_LIBCPP_HIDE_FROM_ABI function& operator=(nullptr_t) _NOEXCEPT;
|
|
template <class _Fp, class = _EnableIfLValueCallable<__decay_t<_Fp>>>
|
|
_LIBCPP_HIDE_FROM_ABI function& operator=(_Fp&&);
|
|
|
|
_LIBCPP_HIDE_FROM_ABI ~function();
|
|
|
|
// function modifiers:
|
|
_LIBCPP_HIDE_FROM_ABI void swap(function&) _NOEXCEPT;
|
|
|
|
# if _LIBCPP_STD_VER <= 14
|
|
template <class _Fp, class _Alloc>
|
|
_LIBCPP_HIDE_FROM_ABI void assign(_Fp&& __f, const _Alloc& __a) {
|
|
function(allocator_arg, __a, std::forward<_Fp>(__f)).swap(*this);
|
|
}
|
|
# endif
|
|
|
|
// function capacity:
|
|
_LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return static_cast<bool>(__f_); }
|
|
|
|
// deleted overloads close possible hole in the type system
|
|
template <class _R2, class... _ArgTypes2>
|
|
bool operator==(const function<_R2(_ArgTypes2...)>&) const = delete;
|
|
# if _LIBCPP_STD_VER <= 17
|
|
template <class _R2, class... _ArgTypes2>
|
|
bool operator!=(const function<_R2(_ArgTypes2...)>&) const = delete;
|
|
# endif
|
|
|
|
public:
|
|
// function invocation:
|
|
_LIBCPP_HIDE_FROM_ABI _Rp operator()(_ArgTypes...) const;
|
|
|
|
# if _LIBCPP_HAS_RTTI
|
|
// function target access:
|
|
_LIBCPP_HIDE_FROM_ABI const std::type_info& target_type() const _NOEXCEPT;
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI _Tp* target() _NOEXCEPT;
|
|
template <typename _Tp>
|
|
_LIBCPP_HIDE_FROM_ABI const _Tp* target() const _NOEXCEPT;
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
};
|
|
|
|
# if _LIBCPP_STD_VER >= 17
|
|
template <class _Rp, class... _Ap>
|
|
function(_Rp (*)(_Ap...)) -> function<_Rp(_Ap...)>;
|
|
|
|
template <class _Fp, class _Stripped = typename __strip_signature<decltype(&_Fp::operator())>::type>
|
|
function(_Fp) -> function<_Stripped>;
|
|
# endif // _LIBCPP_STD_VER >= 17
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
function<_Rp(_ArgTypes...)>::function(const function& __f) : __f_(__f.__f_) {}
|
|
|
|
# if _LIBCPP_STD_VER <= 14
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <class _Alloc>
|
|
function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&, const function& __f) : __f_(__f.__f_) {}
|
|
# endif
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
function<_Rp(_ArgTypes...)>::function(function&& __f) _NOEXCEPT : __f_(std::move(__f.__f_)) {}
|
|
|
|
# if _LIBCPP_STD_VER <= 14
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <class _Alloc>
|
|
function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&, function&& __f) : __f_(std::move(__f.__f_)) {}
|
|
# endif
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <class _Fp, class>
|
|
function<_Rp(_ArgTypes...)>::function(_Fp __f) : __f_(std::move(__f)) {}
|
|
|
|
# if _LIBCPP_STD_VER <= 14
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <class _Fp, class _Alloc, class>
|
|
function<_Rp(_ArgTypes...)>::function(allocator_arg_t, const _Alloc&, _Fp __f) : __f_(std::move(__f)) {}
|
|
# endif
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
function<_Rp(_ArgTypes...)>& function<_Rp(_ArgTypes...)>::operator=(const function& __f) {
|
|
function(__f).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
function<_Rp(_ArgTypes...)>& function<_Rp(_ArgTypes...)>::operator=(function&& __f) _NOEXCEPT {
|
|
__f_ = std::move(__f.__f_);
|
|
return *this;
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
function<_Rp(_ArgTypes...)>& function<_Rp(_ArgTypes...)>::operator=(nullptr_t) _NOEXCEPT {
|
|
__f_ = nullptr;
|
|
return *this;
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <class _Fp, class>
|
|
function<_Rp(_ArgTypes...)>& function<_Rp(_ArgTypes...)>::operator=(_Fp&& __f) {
|
|
function(std::forward<_Fp>(__f)).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
function<_Rp(_ArgTypes...)>::~function() {}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
void function<_Rp(_ArgTypes...)>::swap(function& __f) _NOEXCEPT {
|
|
__f_.swap(__f.__f_);
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
_Rp function<_Rp(_ArgTypes...)>::operator()(_ArgTypes... __arg) const {
|
|
return __f_(std::forward<_ArgTypes>(__arg)...);
|
|
}
|
|
|
|
# if _LIBCPP_HAS_RTTI
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
const std::type_info& function<_Rp(_ArgTypes...)>::target_type() const _NOEXCEPT {
|
|
return __f_.target_type();
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <typename _Tp>
|
|
_Tp* function<_Rp(_ArgTypes...)>::target() _NOEXCEPT {
|
|
return (_Tp*)(__f_.template target<_Tp>());
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
template <typename _Tp>
|
|
const _Tp* function<_Rp(_ArgTypes...)>::target() const _NOEXCEPT {
|
|
return __f_.template target<_Tp>();
|
|
}
|
|
|
|
# endif // _LIBCPP_HAS_RTTI
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
inline _LIBCPP_HIDE_FROM_ABI bool operator==(const function<_Rp(_ArgTypes...)>& __f, nullptr_t) _NOEXCEPT {
|
|
return !__f;
|
|
}
|
|
|
|
# if _LIBCPP_STD_VER <= 17
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
inline _LIBCPP_HIDE_FROM_ABI bool operator==(nullptr_t, const function<_Rp(_ArgTypes...)>& __f) _NOEXCEPT {
|
|
return !__f;
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const function<_Rp(_ArgTypes...)>& __f, nullptr_t) _NOEXCEPT {
|
|
return (bool)__f;
|
|
}
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
inline _LIBCPP_HIDE_FROM_ABI bool operator!=(nullptr_t, const function<_Rp(_ArgTypes...)>& __f) _NOEXCEPT {
|
|
return (bool)__f;
|
|
}
|
|
|
|
# endif // _LIBCPP_STD_VER <= 17
|
|
|
|
template <class _Rp, class... _ArgTypes>
|
|
inline _LIBCPP_HIDE_FROM_ABI void swap(function<_Rp(_ArgTypes...)>& __x, function<_Rp(_ArgTypes...)>& __y) _NOEXCEPT {
|
|
return __x.swap(__y);
|
|
}
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP_CXX03_LANG
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___FUNCTIONAL_FUNCTION_H
|