[libOption] - Replace std::pair with helper struct. NFC.

Splitted from D35476.

llvm-svn: 308293

lib/Option/OptTable.cpp

@@ -390,27 +390,29 @@ static std::string getOptionHelpName(const OptTable &Opts, OptSpecifier Id) {
   return Name;
 }
 
+namespace {
+struct OptionInfo {
+  std::string Name;
+  StringRef HelpText;
+};
+} // namespace
+
 static void PrintHelpOptionList(raw_ostream &OS, StringRef Title,
-                                std::vector<std::pair<std::string,
+                                std::vector<OptionInfo> &OptionHelp) {
-                                const char*>> &OptionHelp) {
   OS << Title << ":\n";
 
   // Find the maximum option length.
   unsigned OptionFieldWidth = 0;
   for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
-    // Skip titles.
-    if (!OptionHelp[i].second)
-      continue;
-
     // Limit the amount of padding we are willing to give up for alignment.
-    unsigned Length = OptionHelp[i].first.size();
+    unsigned Length = OptionHelp[i].Name.size();
     if (Length <= 23)
       OptionFieldWidth = std::max(OptionFieldWidth, Length);
   }
 
   const unsigned InitialPad = 2;
   for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
-    const std::string &Option = OptionHelp[i].first;
+    const std::string &Option = OptionHelp[i].Name;
     int Pad = OptionFieldWidth - int(Option.size());
     OS.indent(InitialPad) << Option;
 
@@ -419,7 +421,7 @@ static void PrintHelpOptionList(raw_ostream &OS, StringRef Title,
       OS << "\n";
       Pad = OptionFieldWidth + InitialPad;
     }
-    OS.indent(Pad + 1) << OptionHelp[i].second << '\n';
+    OS.indent(Pad + 1) << OptionHelp[i].HelpText << '\n';
   }
 }
 
@@ -458,8 +460,7 @@ void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
 
   // Render help text into a map of group-name to a list of (option, help)
   // pairs.
-  using helpmap_ty =
+  using helpmap_ty = std::map<std::string, std::vector<OptionInfo>>;
-      std::map<std::string, std::vector<std::pair<std::string, const char*>>>;
   helpmap_ty GroupedOptionHelp;
 
   for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
@@ -478,7 +479,7 @@ void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
     if (const char *Text = getOptionHelpText(Id)) {
       const char *HelpGroup = getOptionHelpGroup(*this, Id);
       const std::string &OptName = getOptionHelpName(*this, Id);
-      GroupedOptionHelp[HelpGroup].push_back(std::make_pair(OptName, Text));
+      GroupedOptionHelp[HelpGroup].push_back({OptName, Text});
     }
   }