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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/StreamableContainer.hh 0006 //---------------------------------------------------------------------------// 0007 #pragma once 0008 0009 #include <ostream> 0010 0011 namespace celeritas 0012 { 0013 //---------------------------------------------------------------------------// 0014 /*! 0015 * Helper class to print a contiguous range of data. 0016 * 0017 * Since this class is used by both \c Array and \c Span, it is templated 0018 * solely on the item type, and directly uses a non-owning pointer with a size. 0019 * \code 0020 std::cout << StreamableContainer{s.data(), s.size()} << std::endl; 0021 \endcode 0022 */ 0023 template<class T> 0024 struct StreamableContainer 0025 { 0026 T const* data{}; 0027 std::size_t size{}; 0028 }; 0029 0030 //---------------------------------------------------------------------------// 0031 // Template deduction guides 0032 //---------------------------------------------------------------------------// 0033 0034 template<class T> 0035 StreamableContainer(T const*, std::size_t) -> StreamableContainer<T>; 0036 0037 //---------------------------------------------------------------------------// 0038 // FREE FUNCTIONS 0039 //---------------------------------------------------------------------------// 0040 /*! 0041 * Write a container to a stream. 0042 */ 0043 template<class T> 0044 inline std::ostream& operator<<(std::ostream& os, StreamableContainer<T> sc) 0045 { 0046 std::streamsize size = static_cast<std::streamsize>(sc.size); 0047 std::streamsize width = os.width(); 0048 std::streamsize remainder = 0; 0049 0050 os.width(0); 0051 os << '{'; 0052 if (width > 2 + (size - 1)) 0053 { 0054 // Subtract width for spaces and braces 0055 width -= 2 + (size - 1); 0056 // Individual width is 1/N of that, rounded down, keep remainder 0057 // separate 0058 remainder = width % size; 0059 width = width / size; 0060 } 0061 else 0062 { 0063 width = 0; 0064 } 0065 0066 // First element gets the remainder 0067 os.width(width + remainder); 0068 if (size > 0) 0069 { 0070 os << sc.data[0]; 0071 } 0072 0073 for (std::streamsize i = 1; i < size; ++i) 0074 { 0075 os << ','; 0076 os.width(width); 0077 os << sc.data[i]; 0078 } 0079 os << '}'; 0080 0081 return os; 0082 } 0083 0084 //---------------------------------------------------------------------------// 0085 } // namespace celeritas
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