00e128e42a
Original-commit: flang-compiler/f18@e8ec4b88bd Reviewed-on: https://github.com/flang-compiler/f18/pull/531 Tree-same-pre-rewrite: false
65 lines
2 KiB
C++
65 lines
2 KiB
C++
// Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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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 FORTRAN_EVALUATE_FORMATTING_H_
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#define FORTRAN_EVALUATE_FORMATTING_H_
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// It is inconvenient in C++ to have std::ostream::operator<<() as a direct
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// friend function of a class template with many instantiations, so the
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// various representational class templates in lib/evaluate format themselves
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// via AsFortran(std::ostream &) member functions, which the operator<<()
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// overload below will call. Others have AsFortran() member functions that
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// return strings.
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//
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// This header is meant to be included by the headers that define the several
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// representational class templates that need it, not by external clients.
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#include "../common/indirection.h"
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#include <optional>
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#include <ostream>
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#include <type_traits>
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namespace Fortran::evaluate {
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extern bool formatForPGF90;
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template<typename A>
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auto operator<<(std::ostream &o, const A &x) -> decltype(x.AsFortran(o)) {
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return x.AsFortran(o);
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}
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template<typename A>
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auto operator<<(std::ostream &o, const A &x) -> decltype(o << x.AsFortran()) {
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return o << x.AsFortran();
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}
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template<typename A, bool COPYABLE>
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auto operator<<(
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std::ostream &o, const Fortran::common::Indirection<A, COPYABLE> &x)
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-> decltype(o << x.value()) {
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return o << x.value();
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}
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template<typename A>
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auto operator<<(std::ostream &o, const std::optional<A> &x)
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-> decltype(o << *x) {
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if (x.has_value()) {
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o << *x;
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} else {
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o << "(nullopt)";
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}
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return o;
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}
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}
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#endif // FORTRAN_EVALUATE_FORMATTING_H_
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