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authorGravatar Abseil Team <absl-team@google.com>2019-12-14 08:24:07 -0800
committerGravatar CJ Johnson <johnsoncj@google.com>2019-12-16 15:25:20 -0500
commitbf86cfe165ef7d70dfe68f0b8fc0c018bc79a577 (patch)
tree2b1ec2a8f3464f3e1ea0e2c2296c5752428f1024 /absl/functional/internal
parent12bc53e0318d80569270a5b26ccbc62b52022b89 (diff)
Export of internal Abseil changes
-- 20b3acaff75d05315f272747956b01405adccafb by Greg Falcon <gfalcon@google.com>: Re-import of CCTZ from GitHub, with new ABSL_NAMESPACE_ transform applied. PiperOrigin-RevId: 285564474 -- 4d9e3fcabcea33c8b0b69f094ad2eddc0fa19557 by Derek Mauro <dmauro@google.com>: Moves the disabling of a warning to before the function begins. MSVC apparently requires this for warnings in the range 4700-4999. https://docs.microsoft.com/en-us/cpp/preprocessor/warning?redirectedfrom=MSDN&view=vs-2019 PiperOrigin-RevId: 285516232 -- 4a060cbeda76e89693c50276ae5b62cbf0fff39a by Derek Mauro <dmauro@google.com>: MSVC: Fixes uniform_real_distribution_test in opt mode Disables a constant arithmetic overflow warning in a test that tests the behavior on overflow. This should be tested because a user might have this warning disabled. PiperOrigin-RevId: 285452242 -- 548ab2f4cbe59bd6f6bf493af4f9ea765c4fa949 by Andy Soffer <asoffer@google.com>: Release absl::bind_front, a C++11-compliant work-alike type for the C++20 std::bind_front. PiperOrigin-RevId: 285247872 GitOrigin-RevId: 20b3acaff75d05315f272747956b01405adccafb Change-Id: I00fe45939246cba9bfc7be375d67787d2eb57cd3
Diffstat (limited to 'absl/functional/internal')
-rw-r--r--absl/functional/internal/front_binder.h95
1 files changed, 95 insertions, 0 deletions
diff --git a/absl/functional/internal/front_binder.h b/absl/functional/internal/front_binder.h
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+++ b/absl/functional/internal/front_binder.h
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+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Implementation details for `absl::bind_front()`.
+
+#ifndef ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
+#define ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
+
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/invoke.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/meta/type_traits.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace functional_internal {
+
+// Invoke the method, expanding the tuple of bound arguments.
+template <class R, class Tuple, size_t... Idx, class... Args>
+R Apply(Tuple&& bound, absl::index_sequence<Idx...>, Args&&... free) {
+ return base_internal::Invoke(
+ absl::forward<Tuple>(bound).template get<Idx>()...,
+ absl::forward<Args>(free)...);
+}
+
+template <class F, class... BoundArgs>
+class FrontBinder {
+ using BoundArgsT = absl::container_internal::CompressedTuple<F, BoundArgs...>;
+ using Idx = absl::make_index_sequence<sizeof...(BoundArgs) + 1>;
+
+ BoundArgsT bound_args_;
+
+ public:
+ template <class... Ts>
+ constexpr explicit FrontBinder(absl::in_place_t, Ts&&... ts)
+ : bound_args_(absl::forward<Ts>(ts)...) {}
+
+ template <class... FreeArgs,
+ class R = base_internal::InvokeT<F&, BoundArgs&..., FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) & {
+ return functional_internal::Apply<R>(bound_args_, Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+
+ template <class... FreeArgs,
+ class R = base_internal::InvokeT<const F&, const BoundArgs&...,
+ FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) const& {
+ return functional_internal::Apply<R>(bound_args_, Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+
+ template <class... FreeArgs, class R = base_internal::InvokeT<
+ F&&, BoundArgs&&..., FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) && {
+ // This overload is called when *this is an rvalue. If some of the bound
+ // arguments are stored by value or rvalue reference, we move them.
+ return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+
+ template <class... FreeArgs,
+ class R = base_internal::InvokeT<const F&&, const BoundArgs&&...,
+ FreeArgs&&...>>
+ R operator()(FreeArgs&&... free_args) const&& {
+ // This overload is called when *this is an rvalue. If some of the bound
+ // arguments are stored by value or rvalue reference, we move them.
+ return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
+ absl::forward<FreeArgs>(free_args)...);
+ }
+};
+
+template <class F, class... BoundArgs>
+using bind_front_t = FrontBinder<decay_t<F>, absl::decay_t<BoundArgs>...>;
+
+} // namespace functional_internal
+ABSL_NAMESPACE_END
+} // namespace absl
+
+#endif // ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_