gen_utils.h

 
#pragma once
 
#ifndef gen_utils_h
#define gen_utils_h
 
#include <boost/lexical_cast.hpp>
#include "include_base_utils.h"
#include "common/util.h"
 
namespace gen_utils
{
  // ------------------------- VALUE RECONCILATION ----------------------------
 
  // TODO: refactor common template code
  template <class T, typename std::enable_if<std::is_same<T, std::string>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, boost::optional<bool> resolve_defined, boost::optional<bool> resolve_true, boost::optional<bool> resolve_max, const std::string& err_msg = "") {
 
    // check for equality
    if (val1 == val2) return val1;
 
    // resolve one value none
    if (val1 == boost::none || val2 == boost::none) {
      if (resolve_defined != boost::none && *resolve_defined == false) return boost::none;
      else return val1 == boost::none ? val2 : val1;
    }
 
    throw std::runtime_error(std::string("Cannot reconcile strings: ") + boost::lexical_cast<std::string>(val1) + std::string(" vs ") + boost::lexical_cast<std::string>(val2) + (!err_msg.empty() ? std::string(". ") + err_msg : std::string("")));
  }
  template <class T, typename std::enable_if<std::is_same<T, std::string>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, const std::string& err_msg = "") {
    return reconcile(val1, val2, boost::none, boost::none, boost::none, err_msg);
  }
 
  template <class T, typename std::enable_if<std::is_integral<T>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, boost::optional<bool> resolve_defined, boost::optional<bool> resolve_true, boost::optional<bool> resolve_max, const std::string& err_msg = "") {
 
    // check for equality
    if (val1 == val2) return val1;
 
    // resolve one value none
    if (val1 == boost::none || val2 == boost::none) {
      if (resolve_defined != boost::none && *resolve_defined == false) return boost::none;
      else return val1 == boost::none ? val2 : val1;
    }
 
    // resolve different booleans
    if (resolve_true != boost::none) return (bool) val1 == *resolve_true ? val1 : val2; // if resolve true, return true, else return false
 
    // resolve different numbers
    if (resolve_max != boost::none) return *resolve_max ? std::max(*val1, *val2) : std::min(*val1, *val2);
 
    // cannot reconcile
    throw std::runtime_error(std::string("Cannot reconcile integrals: ") + boost::lexical_cast<std::string>(val1) + std::string(" vs ") + boost::lexical_cast<std::string>(val2) + (!err_msg.empty() ? std::string(". ") + err_msg : std::string("")));
  }
  template <class T, typename std::enable_if<std::is_integral<T>::value, T>::type* = nullptr>
  boost::optional<T> reconcile(const boost::optional<T>& val1, const boost::optional<T>& val2, const std::string& err_msg = "") {
    return reconcile(val1, val2, boost::none, boost::none, boost::none, err_msg);
  }
 
  template <class T>
  std::vector<T> reconcile(const std::vector<T>& v1, const std::vector<T>& v2, const std::string& err_msg = "") {
 
    // check for equality
    if (v1 == v2) return v1;
 
    // resolve one vector empty
    if (v1.empty()) return v2;
    if (v2.empty()) return v1;
 
    // otherwise cannot reconcile
    throw std::runtime_error("Cannot reconcile vectors" + (!err_msg.empty() ? std::string(". ") + err_msg : std::string("")));
  }
}
#endif /* gen_utils_h */