template <typename R, typename... Args>

class FunctionRef

Defined at line 87 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

FunctionRef

An `absl::FunctionRef` is a lightweight wrapper to any invocable object with

a compatible signature. Generally, an `absl::FunctionRef` should only be used

as an argument type and should be preferred as an argument over a const

reference to a `std::function`. `absl::FunctionRef` itself does not allocate,

although the wrapped invocable may.

Example:

// The following function takes a function callback by const reference

bool Visitor(const std::function

<void

(my_proto

absl::string_view)>

callback);

// Assuming that the function is not stored or otherwise copied, it can be

// replaced by an `absl::FunctionRef`:

bool Visitor(absl::FunctionRef

<void

(my_proto

, absl::string_view)>

callback);

Public Methods

template <typename F, typename = EnableIfCompatible<std::enable_if_t<
                                    !std::is_same_v<FunctionRef, absl::remove_cvref_t<F>>, F&>>>

void FunctionRef<R (Args...)> (F && f)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 111 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <typename F, typename = EnableIfCompatible<F*>, absl::functional_internal::EnableIf<std::is_function_v<F>> = 0>

void FunctionRef<R (Args...)> (F * f)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 123 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <auto F, typename = EnableIfCompatible<decltype(F)>>

void FunctionRef<R (Args...)> (nontype_t<F> )

Similar to the other overloads, but passes the address of a known callable

`F` at compile time. This allows calling arbitrary functions while avoiding

an indirection.

Needs C++20 as `nontype_t` needs C++20 for `auto` template parameters.

Defined at line 135 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <auto F, typename Obj, typename = EnableIfCompatible<decltype(F), std::remove_reference_t<Obj>&>, absl::functional_internal::EnableIf<!std::is_rvalue_reference_v<Obj&&>> =
                              0>

void FunctionRef<R (Args...)> (nontype_t<F> , Obj && obj)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 145 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <auto F, typename Obj, typename = EnableIfCompatible<decltype(F), std::remove_reference_t<Obj>&>, absl::functional_internal::EnableIf<!std::is_rvalue_reference_v<Obj&&>> =
                              0>

void FunctionRef<R (Args...)> (nontype_t<F> , Obj && obj)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 145 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <auto F, typename Obj, typename = EnableIfCompatible<decltype(F), Obj*>>

void FunctionRef<R (Args...)> (nontype_t<F> , Obj * obj)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 154 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

R operator() (Args... args)

Call the underlying object.

Defined at line 164 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <typename F, typename = EnableIfCompatible<std::enable_if_t<
                              !std::is_same_v<FunctionRef, absl::remove_cvref_t<F>>, const F&>>>

void FunctionRef<R (Args...) const> (const F & f)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 190 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

template <auto F, typename Obj, typename = EnableIfCompatible<decltype(F), const Obj*>>

void FunctionRef<R (Args...) const> (nontype_t<F> arg, const Obj * obj)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 216 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h

Protected Methods

template <typename F>

void FunctionRef<R (Args...)> (std::in_place_t , F && f)

NOLINTNEXTLINE(google-explicit-constructor)

Defined at line 99 of file ../../third_party/abseil-cpp/src/absl/functional/function_ref.h