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This PR condenses the namespaces in the tint/reader/spirv folder. Change-Id: I80cf1e7d3587020359d790381d147fde140b0ba5 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86033 Reviewed-by: Ben Clayton <bclayton@google.com> Auto-Submit: Dan Sinclair <dsinclair@chromium.org> Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
// Copyright 2020 The Tint 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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// http://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 SRC_TINT_READER_SPIRV_FAIL_STREAM_H_
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#define SRC_TINT_READER_SPIRV_FAIL_STREAM_H_
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#include <ostream>
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namespace tint::reader::spirv {
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/// A FailStream object accumulates values onto a given std::ostream,
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/// and can be used to record failure by writing the false value
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/// to given a pointer-to-bool.
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class FailStream {
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public:
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/// Creates a new fail stream
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/// @param status_ptr where we will write false to indicate failure. Assumed
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/// to be a valid pointer to bool.
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/// @param out output stream where a message should be written to explain
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/// the failure
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FailStream(bool* status_ptr, std::ostream* out)
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: status_ptr_(status_ptr), out_(out) {}
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/// Copy constructor
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/// @param other the fail stream to clone
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FailStream(const FailStream& other) = default;
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/// Converts to a boolean status. A true result indicates success,
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/// and a false result indicates failure.
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/// @returns the status
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operator bool() const { return *status_ptr_; }
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/// Returns the current status value. This can be more readable
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/// the conversion operator.
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/// @returns the status
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bool status() const { return *status_ptr_; }
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/// Records failure.
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/// @returns a FailStream
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FailStream& Fail() {
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*status_ptr_ = false;
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return *this;
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}
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/// Appends the given value to the message output stream.
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/// @param val the value to write to the output stream.
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/// @returns this object
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template <typename T>
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FailStream& operator<<(const T& val) {
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*out_ << val;
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return *this;
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}
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private:
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bool* status_ptr_;
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std::ostream* out_;
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};
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} // namespace tint::reader::spirv
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#endif // SRC_TINT_READER_SPIRV_FAIL_STREAM_H_
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