From 51cd6dbddffa15d94e14014cf01ac53cd5082308 Mon Sep 17 00:00:00 2001
From: Shuoliu Yang <visysl@outlook.com>
Date: Wed, 14 Aug 2024 21:52:40 +0800
Subject: [PATCH] remove ranges

---
 include/Layer/Config.hpp  |  3 +--
 src/Layer/Config.cpp      | 35 +++++++++++++----------------------
 src/Layer/StructModel.cpp |  9 ++++-----
 3 files changed, 18 insertions(+), 29 deletions(-)

diff --git a/include/Layer/Config.hpp b/include/Layer/Config.hpp
index 32493442..3983f5d2 100644
--- a/include/Layer/Config.hpp
+++ b/include/Layer/Config.hpp
@@ -36,7 +36,6 @@ FILE* getLogStream(const char* category);
 #include <format>
 #define STD_FORMAT_SUPPORT
 #define STD_FORMAT(...) std::format(__VA_ARGS__)
-#define STD_RANGES_SUPPORT
 #else
 #define STD_FORMAT(...) ((void)sizeof(__VA_ARGS__), std::string(""))
 #endif
@@ -51,7 +50,7 @@ FILE* getLogStream(const char* category);
     auto UNI_NAME(s) = std::format(__VA_ARGS__);                                                   \
     if (!UNI_NAME(s).empty())                                                                      \
     {                                                                                              \
-      fprintf(UNI_NAME(f), "[" STRINGIFY(label) "]:%s\n", UNI_NAME(s).c_str());                     \
+      fprintf(UNI_NAME(f), "[" STRINGIFY(label) "]:%s\n", UNI_NAME(s).c_str());                    \
     }                                                                                              \
   } while (0);
 #else
diff --git a/src/Layer/Config.cpp b/src/Layer/Config.cpp
index 1edebdb3..12f48089 100644
--- a/src/Layer/Config.cpp
+++ b/src/Layer/Config.cpp
@@ -20,9 +20,6 @@
 #include <string>
 #include <stdlib.h>
 #include <cstring>
-#ifdef STD_RANGES_SUPPORT
-#include <ranges>
-#endif
 #include <unordered_map>
 #include <iostream>
 #include <algorithm>
@@ -42,32 +39,31 @@ std::vector<std::pair<std::string_view, std::string_view>> parse(const char* var
    * other categories streamed to file with name <stream>.log
    * stream can be 'stderr', 'stdout', 'null' or a file name
    */
-  std::vector<std::pair<std::string_view, std::string_view>> result;
-#ifdef STD_RANGES_SUPPORT
-  result.reserve(4);
-  std::string_view inputSV(var);
 
-  auto categoryStreamPairs = inputSV | std::views::split(';');
-  for (auto&& pair : categoryStreamPairs)
+  std::vector<std::pair<std::string_view, std::string_view>> result;
+  std::string                                                input(var);
+  size_t                                                     pos = 0;
+  while (pos < input.size())
   {
-    std::vector<std::string_view> categoryStream;
-    for (auto&& part : pair | std::views::split(':'))
+    size_t nextPos = input.find(';', pos);
+    if (nextPos == std::string::npos)
     {
-      categoryStream.emplace_back(&*part.begin(), std::ranges::distance(part));
+      nextPos = input.size();
     }
-    if (categoryStream.size() == 2)
+    std::string_view categoryStream(input.c_str() + pos, nextPos - pos);
+    size_t           colonPos = categoryStream.find(':');
+    if (colonPos != std::string::npos)
     {
-      result.emplace_back(categoryStream[0], categoryStream[1]);
+      result.emplace_back(categoryStream.substr(0, colonPos), categoryStream.substr(colonPos + 1));
     }
+    pos = nextPos + 1;
   }
-#endif
   return result;
 }
 
 struct ConfigVars
 {
-  std::once_flag flag;
-
+  std::once_flag                                             flag;
   std::vector<std::pair<std::string_view, std::string_view>> logConfigs;
   bool                                                       enableLog{ false };
   ConfigVars()
@@ -119,9 +115,6 @@ namespace VGG::layer
 
 FILE* getLogStream(const char* category)
 {
-#ifndef STD_RANGES_SUPPORT
-  return nullptr;
-#else
   if (!g_configVars.enableLog)
   {
     return nullptr;
@@ -130,7 +123,6 @@ FILE* getLogStream(const char* category)
   {
     return stderr;
   }
-  namespace sv = std::views;
   auto it = g_categoryMap.find(category);
   if (it == g_categoryMap.end())
   {
@@ -183,7 +175,6 @@ FILE* getLogStream(const char* category)
     return it->second.get();
   }
   return stderr;
-#endif
 }
 
 } // namespace VGG::layer
diff --git a/src/Layer/StructModel.cpp b/src/Layer/StructModel.cpp
index 7116a0d0..5dd1565a 100644
--- a/src/Layer/StructModel.cpp
+++ b/src/Layer/StructModel.cpp
@@ -244,15 +244,14 @@ std::vector<StructObject> StructObject::getChildObjects() const
       objects.reserve(m->childObjects().size());
       if (m->isFirstOnTop())
       {
-        //for (const auto& c : *m | std::views::reverse) TODO rewrite this logic without std::views
-        for (const auto& c : *m) // TODO delete this temp line
+        for (auto it = m->childObjects().rbegin(); it != m->childObjects().rend(); ++it)
         {
           toType(
-            c.get(),
+            it->get(),
             [&](EModelObjectType objectType)
-            { objects.emplace_back(dispatchObject(objectType, c.get())); },
+            { objects.emplace_back(dispatchObject(objectType, it->get())); },
             [&](EModelShapeType shapeType)
-            { objects.emplace_back(dispatchObject(shapeType, c.get())); });
+            { objects.emplace_back(dispatchObject(shapeType, it->get())); });
         }
       }
       else