Add a demangle facility

Code was previously inlined into BacktraceManager.

src/utils/BacktraceManager.cpp

@@ -4,10 +4,11 @@
 #include <rang.hpp>
 
 #include <cmath>
-#include <cxxabi.h>
 #include <execinfo.h>
 #include <regex>
 
+#include <Demangle.hpp>
+
 BacktraceManager::BacktraceManager()
 {
   const int size = 100;
@@ -35,7 +36,6 @@ operator<<(std::ostream& os, const BacktraceManager& btm)
     const auto& line = lines[i_line];
     os << rang::fg::green << "[" << std::setw(width) << i_line + 1 << '/' << lines.size() << "] " << rang::fg::reset;
     std::smatch matchex;
-    int status = -1;
     if (std::regex_search(line, matchex, mangled_function)) {
       std::string prefix   = matchex.prefix().str();
       std::string function = line.substr(matchex.position() + 1, matchex.length() - 2);
@@ -43,13 +43,7 @@ operator<<(std::ostream& os, const BacktraceManager& btm)
 
       os << prefix << '(';
       if (function.size() > 0) {
-        char* demangled = abi::__cxa_demangle(function.c_str(), NULL, NULL, &status);
-        if (status == 0) {
-          os << rang::style::bold << demangled << rang::style::reset;
-          free(demangled);
-        } else {
-          os << rang::style::bold << function << rang::style::reset;
-        }
+        os << rang::style::bold << demangle(function) << rang::style::reset;
       }
       os << '+' << suffix << '\n';
     } else {

src/utils/CMakeLists.txt

@@ -8,6 +8,7 @@ add_library(
   BuildInfo.cpp
   BacktraceManager.cpp
   ConsoleManager.cpp
+  Demangle.cpp
   FPEManager.cpp
   Messenger.cpp
   Partitioner.cpp

src/utils/Demangle.cpp

+#include <Demangle.hpp>
+#include <cxxabi.h>
+#include <memory>
+
+std::string
+demangle(const std::string_view mangled)
+{
+  int status = -1;
+
+  char* cxa_demangled = abi::__cxa_demangle(mangled.data(), NULL, NULL, &status);
+  if (status == 0) {
+    std::string demangled{cxa_demangled};
+    free(cxa_demangled);
+    return demangled;
+  } else {
+    return std::string{mangled};
+  }
+}

src/utils/Demangle.hpp

+#ifndef DEMANGLE_HPP
+#define DEMANGLE_HPP
+
+#include <string>
+#include <typeinfo>
+
+std::string demangle(const std::string_view mangled);
+
+template <typename T>
+inline std::string
+demangle()
+{
+  return demangle(typeid(T).name());
+}
+
+#endif   // DEMANGLE_HPP