#pragma once #include "config.h" #include "ref.hh" #include <string> #include <list> #include <set> #include <memory> #include <boost/format.hpp> /* Before 4.7, gcc's std::exception uses empty throw() specifiers for * its (virtual) destructor and what() in c++11 mode, in violation of spec */ #ifdef __GNUC__ #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) #define EXCEPTION_NEEDS_THROW_SPEC #endif #endif namespace nix { /* Inherit some names from other namespaces for convenience. */ using std::string; using std::list; using std::set; using std::vector; using boost::format; struct FormatOrString { string s; FormatOrString(const string & s) : s(s) { }; FormatOrString(const format & f) : s(f.str()) { }; FormatOrString(const char * s) : s(s) { }; }; /* BaseError should generally not be caught, as it has Interrupted as a subclass. Catch Error instead. */ class BaseError : public std::exception { protected: string prefix_; // used for location traces etc. string err; public: unsigned int status; // exit status BaseError(const FormatOrString & fs, unsigned int status = 1); #ifdef EXCEPTION_NEEDS_THROW_SPEC ~BaseError() throw () { }; const char * what() const throw () { return err.c_str(); } #else const char * what() const noexcept { return err.c_str(); } #endif const string & msg() const { return err; } const string & prefix() const { return prefix_; } BaseError & addPrefix(const FormatOrString & fs); }; #define MakeError(newClass, superClass) \ class newClass : public superClass \ { \ public: \ newClass(const FormatOrString & fs, unsigned int status = 1) : superClass(fs, status) { }; \ }; MakeError(Error, BaseError) class SysError : public Error { public: int errNo; SysError(const FormatOrString & fs); }; typedef list<string> Strings; typedef set<string> StringSet; /* Paths are just strings. */ typedef string Path; typedef list<Path> Paths; typedef set<Path> PathSet; }