-- 77c85460dc3c46593b231c5161ac55273bb0c7ef by Abseil Team <absl-team@google.com>: Support int128 in SimpleAtoi. PiperOrigin-RevId: 337946262 -- 0be53049ccf8309650e4e22f23b290e5f75ee828 by Gennadiy Rozental <rogeeff@google.com>: Update build scripts to use --mount instead of --volume to mount the host data into a container. This is somewhat more verbose, but more readable and flexible. More importantly this is what docker documentation is recomending to use now. PiperOrigin-RevId: 337898761 -- 3bc877f1679fdf61ecbf4365287a0403cfc9b53e by Samuel Benzaquen <sbenza@google.com>: Add Cord constructor for constinit instances. PiperOrigin-RevId: 337871148 -- 8b87701892b9c325e78ad4e8e4f16b785a744622 by Chris Kennelly <ckennelly@google.com>: Use the address of kSeed, rather than its value. We initialize kSeed with &kSeed, so these are equivalent, but kSeed requires a load from memory while &kSeed can be formed as a RIP-relative lea. PiperOrigin-RevId: 337868415 GitOrigin-RevId: 77c85460dc3c46593b231c5161ac55273bb0c7ef Change-Id: I3d06c18a123f1be29dad5801e8625952dc41cd95pull/827/head
Abseil Team
4 years ago
committed by
Gennadiy Rozental
parent
8f1c34a77a
commit
4b915e7092
22 changed files with 567 additions and 36 deletions
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// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_STRINGS_INTERNAL_STRING_CONSTANT_H_ |
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#define ABSL_STRINGS_INTERNAL_STRING_CONSTANT_H_ |
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#include "absl/meta/type_traits.h" |
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#include "absl/strings/string_view.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace strings_internal { |
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// StringConstant<T> represents a compile time string constant.
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// It can be accessed via its `absl::string_view value` static member.
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// It is guaranteed that the `string_view` returned has constant `.data()`,
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// constant `.size()` and constant `value[i]` for all `0 <= i < .size()`
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//
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// The `T` is an opaque type. It is guaranteed that different string constants
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// will have different values of `T`. This allows users to associate the string
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// constant with other static state at compile time.
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//
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// Instances should be made using the `MakeStringConstant()` factory function
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// below.
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template <typename T> |
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struct StringConstant { |
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private: |
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// Returns true if `view` points to constant data.
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// Otherwise, it can't be constant evaluated.
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static constexpr bool ValidateConstant(absl::string_view view) { |
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return view.empty() || 2 * view[0] != 1; |
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} |
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public: |
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static constexpr absl::string_view value = T{}(); |
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constexpr absl::string_view operator()() const { return value; } |
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static_assert(ValidateConstant(value), |
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"The input string_view must point to constant data."); |
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}; |
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template <typename T> |
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constexpr absl::string_view StringConstant<T>::value; // NOLINT
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// Factory function for `StringConstant` instances.
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// It supports callables that have a constexpr default constructor and a
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// constexpr operator().
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// It must return an `absl::string_view` or `const char*` pointing to constant
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// data. This is validated at compile time.
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template <typename T> |
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constexpr StringConstant<T> MakeStringConstant(T) { |
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return {}; |
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} |
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} // namespace strings_internal
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ABSL_NAMESPACE_END |
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} // namespace absl
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#endif // ABSL_STRINGS_INTERNAL_STRING_CONSTANT_H_
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// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/strings/internal/string_constant.h" |
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#include "absl/meta/type_traits.h" |
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#include "gmock/gmock.h" |
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#include "gtest/gtest.h" |
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namespace { |
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using absl::strings_internal::MakeStringConstant; |
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struct Callable { |
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constexpr absl::string_view operator()() const { |
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return absl::string_view("Callable", 8); |
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} |
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}; |
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TEST(StringConstant, Traits) { |
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constexpr auto str = MakeStringConstant(Callable{}); |
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using T = decltype(str); |
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EXPECT_TRUE(std::is_empty<T>::value); |
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EXPECT_TRUE(std::is_trivial<T>::value); |
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EXPECT_TRUE(absl::is_trivially_default_constructible<T>::value); |
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EXPECT_TRUE(absl::is_trivially_copy_constructible<T>::value); |
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EXPECT_TRUE(absl::is_trivially_move_constructible<T>::value); |
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EXPECT_TRUE(absl::is_trivially_destructible<T>::value); |
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} |
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TEST(StringConstant, MakeFromCallable) { |
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constexpr auto str = MakeStringConstant(Callable{}); |
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using T = decltype(str); |
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EXPECT_EQ(Callable{}(), T::value); |
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EXPECT_EQ(Callable{}(), str()); |
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} |
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TEST(StringConstant, MakeFromStringConstant) { |
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// We want to make sure the StringConstant itself is a valid input to the
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// factory function.
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constexpr auto str = MakeStringConstant(Callable{}); |
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constexpr auto str2 = MakeStringConstant(str); |
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using T = decltype(str2); |
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EXPECT_EQ(Callable{}(), T::value); |
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EXPECT_EQ(Callable{}(), str2()); |
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} |
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} // namespace
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