toast/log/footer_policies.hpp

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#ifndef toast_log_footer_policies_hpp_INCLUDED
#define toast_log_footer_policies_hpp_INCLUDED

#include <string>
#include <toast/concept_check.hpp>

namespace toast {
  namespace log {

    template <typename Policy>
    struct FooterPolicyConcept
    {
      void constraints() {
        s = p.footer(ERROR);
      }
    private:
      Policy p;
      std::string s;
    };
    
    struct no_footer {
      static char const* footer(log::severity severity) { return ""; }
    protected:
      ~no_footer() {}
    };
    
    struct newline
    {
      static char const* footer(log::severity severity) { return "\n"; }
    protected:
      ~newline() {}
    };
    
    template <typename FirstFooterPolicy, typename SecondFooterPolicy>
    struct footer_policy_aggregator
      : public FirstFooterPolicy, public SecondFooterPolicy
    {
      TOAST_CLASS_REQUIRE(FirstFooterPolicy, toast::log, FooterPolicyConcept);
      TOAST_CLASS_REQUIRE(SecondFooterPolicy, toast::log, FooterPolicyConcept);

      static std::string footer(log::severity severity)
      {
        std::string ret = FirstFooterPolicy::footer(severity);
        ret += SecondFooterPolicy::footer(severity);
        return ret;
      }
    protected:
      ~footer_policy_aggregator() {}
    };

  }
}

#endif // toast_log_footer_policies_hpp_INCLUDED

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