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, 31 insertions, 29 deletions

diff --git a/third_party/nix/src/libstore/derivations.cc b/third_party/nix/src/libstore/derivations.cc
index 9c71d7209e37..f8770327bf9e 100644
--- a/third_party/nix/src/libstore/derivations.cc
+++ b/third_party/nix/src/libstore/derivations.cc
@@ -11,11 +11,11 @@ namespace nix {
 
 void DerivationOutput::parseHashInfo(bool& recursive, Hash& hash) const {
   recursive = false;
-  string algo = hashAlgo;
+  std::string algo = hashAlgo;
 
-  if (string(algo, 0, 2) == "r:") {
+  if (std::string(algo, 0, 2) == "r:") {
     recursive = true;
-    algo = string(algo, 2);
+    algo = std::string(algo, 2);
   }
 
   HashType hashType = parseHashType(algo);
@@ -26,7 +26,7 @@ void DerivationOutput::parseHashInfo(bool& recursive, Hash& hash) const {
   hash = Hash(this->hash, hashType);
 }
 
-Path BasicDerivation::findOutput(const string& id) const {
+Path BasicDerivation::findOutput(const std::string& id) const {
   auto i = outputs.find(id);
   if (i == outputs.end()) {
     throw Error(format("derivation has no output '%1%'") % id);
@@ -35,11 +35,11 @@ Path BasicDerivation::findOutput(const string& id) const {
 }
 
 bool BasicDerivation::isBuiltin() const {
-  return string(builder, 0, 8) == "builtin:";
+  return std::string(builder, 0, 8) == "builtin:";
 }
 
 Path writeDerivation(const ref<Store>& store, const Derivation& drv,
-                     const string& name, RepairFlag repair) {
+                     const std::string& name, RepairFlag repair) {
   PathSet references;
   references.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
   for (auto& i : drv.inputDrvs) {
@@ -48,25 +48,25 @@ Path writeDerivation(const ref<Store>& store, const Derivation& drv,
   /* Note that the outputs of a derivation are *not* references
      (that can be missing (of course) and should not necessarily be
      held during a garbage collection). */
-  string suffix = name + drvExtension;
-  string contents = drv.unparse();
+  std::string suffix = name + drvExtension;
+  std::string contents = drv.unparse();
   return settings.readOnlyMode
              ? store->computeStorePathForText(suffix, contents, references)
              : store->addTextToStore(suffix, contents, references, repair);
 }
 
 /* Read string `s' from stream `str'. */
-static void expect(std::istream& str, const string& s) {
+static void expect(std::istream& str, const std::string& s) {
   char s2[s.size()];
   str.read(s2, s.size());
-  if (string(s2, s.size()) != s) {
+  if (std::string(s2, s.size()) != s) {
     throw FormatError(format("expected string '%1%'") % s);
   }
 }
 
 /* Read a C-style string from stream `str'. */
-static string parseString(std::istream& str) {
-  string res;
+static std::string parseString(std::istream& str) {
+  std::string res;
   expect(str, "\"");
   int c;
   while ((c = str.get()) != '"') {
@@ -89,7 +89,7 @@ static string parseString(std::istream& str) {
 }
 
 static Path parsePath(std::istream& str) {
-  string s = parseString(str);
+  std::string s = parseString(str);
   if (s.empty() || s[0] != '/') {
     throw FormatError(format("bad path '%1%' in derivation") % s);
   }
@@ -116,7 +116,7 @@ static StringSet parseStrings(std::istream& str, bool arePaths) {
   return res;
 }
 
-static Derivation parseDerivation(const string& s) {
+static Derivation parseDerivation(const std::string& s) {
   Derivation drv;
   istringstream_nocopy str(s);
   expect(str, "Derive([");
@@ -125,7 +125,7 @@ static Derivation parseDerivation(const string& s) {
   while (!endOfList(str)) {
     DerivationOutput out;
     expect(str, "(");
-    string id = parseString(str);
+    std::string id = parseString(str);
     expect(str, ",");
     out.path = parsePath(str);
     expect(str, ",");
@@ -163,9 +163,9 @@ static Derivation parseDerivation(const string& s) {
   expect(str, ",[");
   while (!endOfList(str)) {
     expect(str, "(");
-    string name = parseString(str);
+    std::string name = parseString(str);
     expect(str, ",");
-    string value = parseString(str);
+    std::string value = parseString(str);
     expect(str, ")");
     drv.env[name] = value;
   }
@@ -195,7 +195,7 @@ Derivation Store::derivationFromPath(const Path& drvPath) {
   }
 }
 
-static void printString(string& res, const string& s) {
+static void printString(std::string& res, const std::string& s) {
   res += '"';
   for (const char* i = s.c_str(); *i != 0; i++) {
     if (*i == '\"' || *i == '\\') {
@@ -215,7 +215,8 @@ static void printString(string& res, const string& s) {
 }
 
 template <class ForwardIterator>
-static void printStrings(string& res, ForwardIterator i, ForwardIterator j) {
+static void printStrings(std::string& res, ForwardIterator i,
+                         ForwardIterator j) {
   res += '[';
   bool first = true;
   for (; i != j; ++i) {
@@ -229,8 +230,8 @@ static void printStrings(string& res, ForwardIterator i, ForwardIterator j) {
   res += ']';
 }
 
-string Derivation::unparse() const {
-  string s;
+std::string Derivation::unparse() const {
+  std::string s;
   s.reserve(65536);
   s += "Derive([";
 
@@ -297,7 +298,7 @@ string Derivation::unparse() const {
   return s;
 }
 
-bool isDerivation(const string& fileName) {
+bool isDerivation(const std::string& fileName) {
   return hasSuffix(fileName, drvExtension);
 }
 
@@ -354,22 +355,23 @@ Hash hashDerivationModulo(Store& store, Derivation drv) {
   return hashString(htSHA256, drv.unparse());
 }
 
-DrvPathWithOutputs parseDrvPathWithOutputs(const string& s) {
+DrvPathWithOutputs parseDrvPathWithOutputs(const std::string& s) {
   size_t n = s.find('!');
   return n == std::string::npos
-             ? DrvPathWithOutputs(s, std::set<string>())
-             : DrvPathWithOutputs(
-                   string(s, 0, n),
-                   tokenizeString<std::set<string> >(string(s, n + 1), ","));
+             ? DrvPathWithOutputs(s, std::set<std::string>())
+             : DrvPathWithOutputs(std::string(s, 0, n),
+                                  tokenizeString<std::set<std::string> >(
+                                      std::string(s, n + 1), ","));
 }
 
 Path makeDrvPathWithOutputs(const Path& drvPath,
-                            const std::set<string>& outputs) {
+                            const std::set<std::string>& outputs) {
   return outputs.empty() ? drvPath
                          : drvPath + "!" + concatStringsSep(",", outputs);
 }
 
-bool wantOutput(const string& output, const std::set<string>& wanted) {
+bool wantOutput(const std::string& output,
+                const std::set<std::string>& wanted) {
   return wanted.empty() || wanted.find(output) != wanted.end();
 }