modernize C++: move from boost::bind to std::bind

src/Mod/ReverseEngineering/App/ApproxSurface.cpp

@@ -40,7 +40,7 @@
 
 
 using namespace Reen;
-namespace bp = boost::placeholders;
+namespace sp = std::placeholders;
 
 // SplineBasisfunction
 
@@ -1092,7 +1092,7 @@ bool BSplineParameterCorrection::SolveWithSmoothing(double fWeight)
     std::generate(columns.begin(), columns.end(), Base::iotaGen<int>(0));
     ScalarProduct scalar(M);
     QFuture< std::vector<double> > future = QtConcurrent::mapped
-        (columns, boost::bind(&ScalarProduct::multiply, &scalar, bp::_1));
+        (columns, std::bind(&ScalarProduct::multiply, &scalar, sp::_1));
     QFutureWatcher< std::vector<double> > watcher;
     watcher.setFuture(future);
     watcher.waitForFinished();