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-rw-r--r--include/ftl/ignore.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/include/ftl/ignore.h b/include/ftl/ignore.h
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+++ b/include/ftl/ignore.h
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+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * 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
+ *
+ * http://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.
+ */
+
+#pragma once
+
+namespace android::ftl {
+
+// An alternative to `std::ignore` that makes it easy to ignore multiple values.
+//
+// Examples:
+//
+// void ftl_ignore_multiple(int arg1, const char* arg2, std::string arg3) {
+// // When invoked, all the arguments are ignored.
+// ftl::ignore(arg1, arg2, arg3);
+// }
+//
+// void ftl_ignore_single(int arg) {
+// // It can be used like std::ignore to ignore a single value
+// ftl::ignore = arg;
+// }
+//
+inline constexpr struct {
+ // NOLINTNEXTLINE(misc-unconventional-assign-operator, readability-named-parameter)
+ constexpr auto operator=(auto&&) const -> decltype(*this) { return *this; }
+ // NOLINTNEXTLINE(readability-named-parameter)
+ constexpr void operator()(auto&&...) const {}
+} ignore;
+
+} // namespace android::ftl \ No newline at end of file