log_message.hpp

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#ifndef HTGS_LOG_MESSAGE_HPP
#define HTGS_LOG_MESSAGE_HPP

#include <iosfwd>
#include <iostream>

#define HTGS_VERBOSE 1

#define HTGS_LG_MSG_LEVEL(msg, level) if (!HTGS_LOG_ENABLED || HTGS_LOG_LEVEL < level) {} \
        else htgs_lglog() << " "  << msg

#define HTGS_LG(msg) HTGS_LG_MSG_LEVEL(msg, 0)

#define HTGS_LG_VERBOSE(msg) HTGS_LG_MSG_LEVEL(msg, HTGS_VERBOSE)

#ifdef HTGS_LOG_LEVEL_VERBOSE
#define HTGS_LOG_LEVEL HTGS_VERBOSE
#else
#define HTGS_LOG_LEVEL 0
#endif

#ifdef HTGS_LOG_FLAG
#define HTGS_LOG_ENABLED 1
#else
#define HTGS_LOG_ENABLED 0
#endif

struct htgs_lglog {
  std::ostream &os_;
  mutable bool has_endl_;
  htgs_lglog(std::ostream &os = std::cout) : os_(os), has_endl_(false) {}
  ~htgs_lglog() { if (!has_endl_) os_ << std::endl; }
  template<typename T>
  static bool has_endl(const T &) { return false; }
  static bool has_endl(char c) { return (c == '\n'); }
  static bool has_endl(std::string s) { return has_endl(*s.rbegin()); }
  static bool has_endl(const char *s) { return has_endl(std::string(s)); }
  template<typename T>
  static bool same_manip(T &(*m)(T &), T &(*e)(T &)) { return (m == e); }
  const htgs_lglog &operator<<(std::ostream &(*m)(std::ostream &)) const {
    has_endl_ = same_manip(m, std::endl);
    os_ << m;
    return *this;
  }
  template<typename T>
  const htgs_lglog &operator<<(const T &v) const {
    has_endl_ = has_endl(v);
    os_ << v;
    return *this;
  }
};

#endif //HTGS_LOG_MESSAGE_HPP