error: expected initializer before ‘std’

``` anisha@linux-trra:~> make g++ -c -m64 -pipe -I/usr/lib64/R/include -I/usr/lib64/R/library/Rcpp/include -I/usr/lib64/R/library/RInside/include -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/home/anisha/qtsdk-2010.05/qt/mkspecs/linux-g++-64 -I. -I/home/anisha/qtsdk-2010.05/qt/include/QtCore -I/home/anisha/qtsdk-2010.05/qt/include/QtGui -I/home/anisha/qtsdk-2010.05/qt/include -I. -o zoomCornerPanDatabaseParser.o zoomCornerPanDatabaseParser.cpp In file included from zoomCornerPanDatabaseParser.h:9:0, from zoomCornerPanDatabaseParser.cpp:1: *******************boundaryLineEquation.cpp:6:1: error: expected initializer before ‘std’ make: *** [zoomCornerPanDatabaseParser.o] Error 1 ``` The `.cpp`: ``` #include <math.h> #include <string> #include "boundaryLineEquation.h" /// This function will return the direction of the new point as w.r.t to the given rectangle. ********************std :: string findPanDirection (float x1, float y1, float x2, float y2, float newX, float newY) { if (x1 > x2) { float temp = x1; x1 =x2; x2 = temp; } if (y2 > y1) { float temp = y2; y2 = y1; y1 = temp; } if (newX < x1 ) { ``` The `.h`: ``` #include <iostream> #ifndef RLINE #define RLINE std :: string findPanDirection (float x1, float y1, float x2, float y2, float newX, float newY); bool returnDistance (float centerPointLng, float centerPointLat, float newCenterPointLng, float newCenterPointLat) #endif ```