1 files changed, 150 insertions, 0 deletions
diff --git a/third_party/nix/src/libutil/types.hh b/third_party/nix/src/libutil/types.hh
new file mode 100644
index 0000000000..92bf469b5c
--- /dev/null
+++ b/third_party/nix/src/libutil/types.hh
@@ -0,0 +1,150 @@
+#pragma once
+
+
+#include "ref.hh"
+
+#include <string>
+#include <list>
+#include <set>
+#include <memory>
+#include <map>
+
+#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;
+
+
+/* A variadic template that does nothing. Useful to call a function
+   for all variadic arguments but ignoring the result. */
+struct nop { template<typename... T> nop(T...) {} };
+
+
+struct FormatOrString
+{
+    string s;
+    FormatOrString(const string & s) : s(s) { };
+    FormatOrString(const format & f) : s(f.str()) { };
+    FormatOrString(const char * s) : s(s) { };
+};
+
+
+/* A helper for formatting strings. ‘fmt(format, a_0, ..., a_n)’ is
+   equivalent to ‘boost::format(format) % a_0 % ... %
+   ... a_n’. However, ‘fmt(s)’ is equivalent to ‘s’ (so no %-expansion
+   takes place). */
+
+inline std::string fmt(const std::string & s)
+{
+    return s;
+}
+
+inline std::string fmt(const char * s)
+{
+    return s;
+}
+
+inline std::string fmt(const FormatOrString & fs)
+{
+    return fs.s;
+}
+
+template<typename... Args>
+inline std::string fmt(const std::string & fs, Args... args)
+{
+    boost::format f(fs);
+    f.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
+    nop{boost::io::detail::feed(f, args)...};
+    return f.str();
+}
+
+
+/* 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 = 1; // exit status
+
+    template<typename... Args>
+    BaseError(unsigned int status, Args... args)
+        : err(fmt(args...))
+        , status(status)
+    {
+    }
+
+    template<typename... Args>
+    BaseError(Args... args)
+        : err(fmt(args...))
+    {
+    }
+
+#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:                                             \
+        using superClass::superClass;                   \
+    };
+
+MakeError(Error, BaseError)
+
+class SysError : public Error
+{
+public:
+    int errNo;
+
+    template<typename... Args>
+    SysError(Args... args)
+        : Error(addErrno(fmt(args...)))
+    { }
+
+private:
+
+    std::string addErrno(const std::string & s);
+};
+
+
+typedef list<string> Strings;
+typedef set<string> StringSet;
+typedef std::map<std::string, std::string> StringMap;
+
+
+/* Paths are just strings. */
+typedef string Path;
+typedef list<Path> Paths;
+typedef set<Path> PathSet;
+
+
+}