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File indexing completed on 2026-10-26 09:34:35
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/StreamableLazy.hh 0006 //---------------------------------------------------------------------------// 0007 #pragma once 0008 0009 #include <ostream> 0010 0011 #include "StreamUtils.hh" 0012 0013 namespace celeritas 0014 { 0015 //---------------------------------------------------------------------------// 0016 /*! 0017 * Lazily evaluate a functor that streams content. 0018 * 0019 * \par Example: 0020 * \code 0021 std::cout << StreamableLazy{[]() { 0022 return do_something_expensive_and_printable(); 0023 }} << std::endl; 0024 \endcode 0025 */ 0026 template<class F> 0027 struct StreamableLazy 0028 { 0029 F func; 0030 0031 //! Write to stream 0032 inline friend std::ostream& operator<<(std::ostream& os, 0033 StreamableLazy const& lazy) 0034 { 0035 return (os << lazy.func()); 0036 } 0037 0038 //! Save as a string 0039 inline friend std::string to_string(StreamableLazy const& svar) 0040 { 0041 return stream_to_string(svar); 0042 } 0043 }; 0044 0045 //---------------------------------------------------------------------------// 0046 // Deduction guide (C++17) 0047 template<class F> 0048 StreamableLazy(F&&) -> StreamableLazy<F>; 0049 0050 //---------------------------------------------------------------------------// 0051 } // namespace celeritas
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