GP-2985 Remove "using namespace" directives

Ghidra/Features/Decompiler/src/decompile/cpp/error.hh

@@ -33,7 +33,35 @@
 #include <cstring>
 #include <cctype>
 
-using namespace std;
+using std::string;
+using std::map;
+using std::set;
+using std::list;
+using std::vector;
+using std::pair;
+using std::make_pair;
+using std::ostream;
+using std::istream;
+using std::ifstream;
+using std::ofstream;
+using std::istringstream;
+using std::ostringstream;
+using std::ios;
+using std::dec;
+using std::hex;
+using std::oct;
+using std::setfill;
+using std::fixed;
+using std::setprecision;
+using std::setw;
+using std::endl;
+using std::ws;
+using std::min;
+using std::max;
+using std::to_string;
+using std::piecewise_construct;
+using std::forward_as_tuple;
+
 
 /// \brief The lowest level error generated by the decompiler
 ///