COMP: fix compile errors on GCC 4.1.2

Code/Common/Core/mvdProcessObjectObserver.cxx

@@ -17,7 +17,7 @@
 
 =========================================================================*/
 #include "mvdProcessObjectObserver.h"
-
+#include <cassert>
 
 /*****************************************************************************/
 /* INCLUDE SECTION                                                           */

Code/Common/Gui/mvdMultiResolutionPyramidWidget.cxx

@@ -29,6 +29,8 @@
 
 //
 // System includes (sorted by alphabetic order)
+#include <cassert>
+#include <cmath>
 
 //
 // ITK includes (sorted by alphabetic order)
@@ -40,7 +42,6 @@
 // Monteverdi includes (sorted by alphabetic order)
 #include "Gui/mvdGui.h"
 
-
 namespace mvd
 {
 
@@ -250,12 +251,21 @@ MultiResolutionPyramidWidget
 
   m_UI->sizeSpinBox->setRange( 1, size );
 
+  assert(m_GDALOverviewsBuilder->CountResolutions() >= m_GDALOverviewsBuilder->GetNbResolutions() );
+
+  // Force C++ implicit cast by declaring local variables to force compiler
+  // to find correct std::pow() signature.
+  //
+  // It fixes compile-time:
+  // error: call of pow(unsigned int, unsigned int) is ambiguous
+  double rf = m_GDALOverviewsBuilder->GetResolutionFactor();
+  int m     =  m_GDALOverviewsBuilder->CountResolutions() -
+    m_GDALOverviewsBuilder->GetNbResolutions();
   m_UI->sizeSpinBox->setValue(
-    std::pow(
-      m_GDALOverviewsBuilder->GetResolutionFactor(),
-      m_GDALOverviewsBuilder->CountResolutions() -
-      m_GDALOverviewsBuilder->GetNbResolutions()
-    )
+    static_cast< int >(
+      std::pow ( rf,
+                 m
+      ) )
   );
 
   m_UI->sizeSpinBox->blockSignals( signalsBlocked );
@@ -306,18 +316,17 @@ MultiResolutionPyramidWidget
 
   unsigned int count = m_GDALOverviewsBuilder->CountResolutions();
 
-  m_UI->sizeSpinBox->setValue( 
-    static_cast< int >(
-      std::pow(
-	m_GDALOverviewsBuilder->GetResolutionFactor(),
-	count -
-	std::min(
-	  m_GDALOverviewsBuilder->GetNbResolutions(),
-	  count
-	)
-      )
-    )
-  );
+  // Force C++ implicit cast by declaring local variables to force compiler
+  // to find correct std::pow() signature.
+  //
+  // It fixes compile-time:
+  // error: call of pow(unsigned int, unsigned int) is ambiguous
+  double rf = m_GDALOverviewsBuilder->GetResolutionFactor();
+  int m     = count -
+    std::min(
+      m_GDALOverviewsBuilder->GetNbResolutions(),
+      count
+	  );
 
   m_UI->sizeSpinBox->blockSignals( signalsBlocked );
 }