style(tvix): Replace remaining typedefs with using statements r/1702

Change (mostly) created via:

  fd . -e hh -e cc | parallel clang-tidy -p ~/builds/nix --fix "'--checks=-*,modernize-use-using'"

Change-Id: I90ad6e64a5399f2005dfb9956074ec51c2c78cea
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1830
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>

1 files changed, 5 insertions, 5 deletions

diff --git a/third_party/nix/src/libutil/types.hh b/third_party/nix/src/libutil/types.hh
index dae81fb94b..b8e7a3c9d5 100644
--- a/third_party/nix/src/libutil/types.hh
+++ b/third_party/nix/src/libutil/types.hh
@@ -107,12 +107,12 @@ class SysError : public Error {
 };
 
 typedef std::list<std::string> Strings;
-typedef std::set<std::string> StringSet;
-typedef std::map<std::string, std::string> StringMap;
+using StringSet = std::set<std::string>;
+using StringMap = std::map<std::string, std::string>;
 
 /* Paths are just strings. */
-typedef std::string Path;
-typedef std::list<Path> Paths;
-typedef std::set<Path> PathSet;
+using Path = std::string;
+using Paths = std::list<Path>;
+using PathSet = std::set<Path>;
 
 }  // namespace nix