C++使用config类从txt文件中设置变量值

我试图弄清楚如何从txt文件或cfg文件中设置变量值，现在我发现这个类很好用。

它非常适合我的需要，但唯一的问题是它只接受字符串和双精度，但我需要设置int/foat值。

那么，有人能告诉我如何修改这个类，使它同时使用整数和浮点吗？

#include "Chameleon.h"
class ConfigFile {
  std::map<std::string,Chameleon> content_;
public:
  ConfigFile(std::string const& configFile);
  Chameleon const& Value(std::string const& section, std::string const& entry) const;
  Chameleon const& Value(std::string const& section, std::string const& entry, double value);
  Chameleon const& Value(std::string const& section, std::string const& entry, std::string const& value);
};

这里是ConfigFile.cpp

std::string trim(std::string const& source, char const* delims = " trn") {
  std::string result(source);
  std::string::size_type index = result.find_last_not_of(delims);
  if(index != std::string::npos)
    result.erase(++index);
  index = result.find_first_not_of(delims);
  if(index != std::string::npos)
    result.erase(0, index);
  else
    result.erase();
  return result;
}
ConfigFile::ConfigFile(std::string const& configFile) {
  std::ifstream file(configFile.c_str());
  std::string line;
  std::string name;
  std::string value;
  std::string inSection;
  int posEqual;
  while (std::getline(file,line)) {
    if (! line.length()) continue;
    if (line[0] == '#') continue;
    if (line[0] == ';') continue;
    if (line[0] == '[') {
      inSection=trim(line.substr(1,line.find(']')-1));
      continue;
    }
    posEqual=line.find('=');
    name  = trim(line.substr(0,posEqual));
    value = trim(line.substr(posEqual+1));
    content_[inSection+'/'+name]=Chameleon(value);
  }
}
Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry) const {
  std::map<std::string,Chameleon>::const_iterator ci = content_.find(section + '/' + entry);
  if (ci == content_.end()) throw "does not exist";
  return ci->second;
}
Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry, double value) {
  try {
    return Value(section, entry);
  } catch(const char *) {
    return content_.insert(std::make_pair(section+'/'+entry, Chameleon(value))).first->second;
  }
}
Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry, std::string const& value) {
  try {
    return Value(section, entry);
  } catch(const char *) {
    return content_.insert(std::make_pair(section+'/'+entry, Chameleon(value))).first->second;
  }
}