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51 lines
1.6 KiB
51 lines
1.6 KiB
// Copyright 2005-2024 Google LLC
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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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//
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// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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//
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// std::pair and std::tuple are used for the arguments of FstClass operations.
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//
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// If a function with a return value is required, use the WithReturnValue
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// template as follows:
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//
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// WithReturnValue<bool, std::tuple<...>>
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#ifndef FST_SCRIPT_ARG_PACKS_H_
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#define FST_SCRIPT_ARG_PACKS_H_
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#include <type_traits>
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namespace fst {
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namespace script {
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// Tack this on to an existing type to add a return value. The syntax for
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// accessing the args is then slightly more stilted, as you must do an extra
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// member access (since the args are stored as a member of this class).
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template <class Retval, class ArgTuple>
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struct WithReturnValue {
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// Avoid reference-to-reference if ArgTuple is a reference.
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using Args = std::remove_reference_t<ArgTuple>;
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Retval retval;
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const Args &args;
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explicit WithReturnValue(const Args &args) : args(args) {}
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};
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} // namespace script
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} // namespace fst
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#endif // FST_SCRIPT_ARG_PACKS_H_
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