Use "#pragma once" to prevent repeated header file inclusion

src/libexpr/attr-path.hh

@@ -1,20 +1,13 @@
-#ifndef __ATTR_PATH_H
-#define __ATTR_PATH_H
+#pragma once
 
 #include "eval.hh"
 
 #include <string>
 #include <map>
 
-
 namespace nix {
 
-    
 void findAlongAttrPath(EvalState & state, const string & attrPath,
     Bindings & autoArgs, Expr * e, Value & v);
 
-    
 }
-
-
-#endif /* !__ATTR_PATH_H */

src/libexpr/common-opts.hh

@@ -1,9 +1,7 @@
-#ifndef __COMMON_OPTS_H
-#define __COMMON_OPTS_H
+#pragma once
 
 #include "eval.hh"
 
-
 namespace nix {
 
 /* Some common option parsing between nix-env and nix-instantiate. */
@@ -17,6 +15,3 @@ bool parseSearchPathArg(const string & arg, Strings::iterator & i,
 Path lookupFileArg(EvalState & state, string s);
 
 }
-
-
-#endif /* !__COMMON_OPTS_H */

src/libexpr/eval-inline.hh

@@ -1,5 +1,4 @@
-#ifndef __EVAL_INLINE_H
-#define __EVAL_INLINE_H
+#pragma once
 
 #include "eval.hh"
 
@@ -8,7 +7,6 @@
 
 namespace nix {
 
-
 LocalNoInlineNoReturn(void throwEvalError(const char * s))
 {
     throw EvalError(s);
@@ -55,7 +53,4 @@ inline void EvalState::forceList(Value & v)
         throwTypeError("value is %1% while a list was expected", showType(v));
 }
 
-
 }
-
-#endif /* !__EVAL_INLINE_H */

src/libexpr/eval.hh

@@ -1,5 +1,4 @@
-#ifndef __EVAL_H
-#define __EVAL_H
+#pragma once
 
 #include "value.hh"
 #include "nixexpr.hh"
@@ -256,6 +255,3 @@ string showType(const Value & v);
 
 
 }
-
-
-#endif /* !__EVAL_H */

src/libexpr/get-drvs.hh

@@ -1,5 +1,4 @@
-#ifndef __GET_DRVS_H
-#define __GET_DRVS_H
+#pragma once
 
 #include "eval.hh"
 
@@ -78,6 +77,3 @@ void getDerivations(EvalState & state, Value & v, const string & pathPrefix,
 
  
 }
-
-
-#endif /* !__GET_DRVS_H */

src/libexpr/names.hh

@@ -1,12 +1,9 @@
-#ifndef __NAMES_H
-#define __NAMES_H
+#pragma once
 
 #include "types.hh"
 
-
 namespace nix {
 
-
 struct DrvName
 {
     string fullName;
@@ -19,15 +16,9 @@ struct DrvName
     bool matches(DrvName & n);
 };
 
-
 typedef list<DrvName> DrvNames;
 
-
 int compareVersions(const string & v1, const string & v2);
 DrvNames drvNamesFromArgs(const Strings & opArgs);
 
-
 }
-
-
-#endif /* !__NAMES_H */

src/libexpr/nixexpr.hh

@@ -1,5 +1,4 @@
-#ifndef __NIXEXPR_H
-#define __NIXEXPR_H
+#pragma once
 
 #include "value.hh"
 #include "symbol-table.hh"
@@ -290,6 +289,3 @@ struct StaticEnv
 
 
 }
-
-
-#endif /* !__NIXEXPR_H */

src/libexpr/symbol-table.hh

@@ -1,5 +1,4 @@
-#ifndef __SYMBOL_TABLE_H
-#define __SYMBOL_TABLE_H
+#pragma once
 
 #include "config.h"
 
@@ -88,5 +87,3 @@ public:
 };
 
 }
-
-#endif /* !__SYMBOL_TABLE_H */

src/libexpr/value-to-xml.hh

@@ -1,5 +1,4 @@
-#ifndef __VALUE_TO_XML_H
-#define __VALUE_TO_XML_H
+#pragma once
 
 #include "nixexpr.hh"
 #include "eval.hh"
@@ -13,5 +12,3 @@ void printValueAsXML(EvalState & state, bool strict, bool location,
     Value & v, std::ostream & out, PathSet & context);
     
 }
-
-#endif /* !__VALUE_TO_XML_H */

src/libexpr/value.hh

@@ -1,5 +1,4 @@
-#ifndef __VALUE_H
-#define __VALUE_H
+#pragma once
 
 #include "symbol-table.hh"
 
@@ -151,5 +150,3 @@ void mkPath(Value & v, const char * s);
 
 
 }
-
-#endif /* !__VALUE_H */