style(3p/nix): Remove 'using std::*' from types.hh r/840

It is considered bad form to use things from includes in headers, as
these directives propagate to everywhere else and can make it
confusing.

types.hh (which is includes almost literally everywhere) had some of
these directives, which this commit removes.

1 files changed, 2 insertions, 2 deletions

diff --git a/third_party/nix/src/libstore/optimise-store.cc b/third_party/nix/src/libstore/optimise-store.cc
index caeff72363a4..7217d54ca9af 100644
--- a/third_party/nix/src/libstore/optimise-store.cc
+++ b/third_party/nix/src/libstore/optimise-store.cc
@@ -83,7 +83,7 @@ Strings LocalStore::readDirectoryIgnoringInodes(const Path& path,
       continue;
     }
 
-    string name = dirent->d_name;
+    std::string name = dirent->d_name;
     if (name == "." || name == "..") {
       continue;
     }
@@ -271,7 +271,7 @@ void LocalStore::optimiseStore(OptimiseStats& stats) {
   }
 }
 
-static string showBytes(unsigned long long bytes) {
+static std::string showBytes(unsigned long long bytes) {
   return (format("%.2f MiB") % (bytes / (1024.0 * 1024.0))).str();
 }