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File indexing completed on 2026-11-01 10:04:15
0001 //------------------------------- -*- C++ -*- -------------------------------// 0002 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details 0003 // SPDX-License-Identifier: (Apache-2.0 OR MIT) 0004 //---------------------------------------------------------------------------// 0005 //! \file corecel/io/StreamableVariant.hh 0006 //---------------------------------------------------------------------------// 0007 #pragma once 0008 0009 #include <ostream> 0010 #include <variant> 0011 0012 #include "corecel/Assert.hh" 0013 0014 #include "StreamUtils.hh" 0015 0016 namespace celeritas 0017 { 0018 //---------------------------------------------------------------------------// 0019 /*! 0020 * Helper class to print a variant to a stream. 0021 * 0022 * Example: 0023 * \code 0024 std::cout << StreamableVariant{surface} << std::endl; 0025 \endcode 0026 */ 0027 template<class T> 0028 struct StreamableVariant 0029 { 0030 T value; 0031 0032 //! Write to stream 0033 friend std::ostream& operator<<(std::ostream& os, 0034 StreamableVariant const& svar) 0035 { 0036 CELER_ASSUME(!svar.value.valueless_by_exception()); 0037 std::visit(GenericToStream{os}, svar.value); 0038 return os; 0039 } 0040 0041 //! Save as a string 0042 friend std::string to_string(StreamableVariant const& svar) 0043 { 0044 return stream_to_string(svar); 0045 } 0046 }; 0047 0048 //---------------------------------------------------------------------------// 0049 // Deduction guide 0050 template<class T> 0051 StreamableVariant(T&&) -> StreamableVariant<T>; 0052 0053 //---------------------------------------------------------------------------// 0054 } // namespace celeritas
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