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, 4 insertions, 3 deletions

diff --git a/third_party/nix/src/libutil/xml-writer.cc b/third_party/nix/src/libutil/xml-writer.cc
index 11cd632399ad..d34e9a2f0d59 100644
--- a/third_party/nix/src/libutil/xml-writer.cc
+++ b/third_party/nix/src/libutil/xml-writer.cc
@@ -26,10 +26,10 @@ void XMLWriter::indent_(size_t depth) {
   if (!indent) {
     return;
   }
-  output << string(depth * 2, ' ');
+  output << std::string(depth * 2, ' ');
 }
 
-void XMLWriter::openElement(const string& name, const XMLAttrs& attrs) {
+void XMLWriter::openElement(const std::string& name, const XMLAttrs& attrs) {
   assert(!closed);
   indent_(pendingElems.size());
   output << "<" << name;
@@ -54,7 +54,8 @@ void XMLWriter::closeElement() {
   }
 }
 
-void XMLWriter::writeEmptyElement(const string& name, const XMLAttrs& attrs) {
+void XMLWriter::writeEmptyElement(const std::string& name,
+                                  const XMLAttrs& attrs) {
   assert(!closed);
   indent_(pendingElems.size());
   output << "<" << name;