Removed usage of Boost static assert.

code/SpatialSort.cpp

@@ -42,7 +42,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 /** @file Implementation of the helper class to quickly find vertices close to a given position */
 
 #include "SpatialSort.h"
-#include <boost/static_assert.hpp>
 #include "../include/assimp/ai_assert.h"
 
 using namespace Assimp;
@@ -192,14 +191,14 @@ namespace {
         // If this assertion fails, signed int is not big enough to store a float on your platform.
         //  Please correct the declaration of BinFloat a few lines above - but do it in a portable,
         //  #ifdef'd manner!
-        BOOST_STATIC_ASSERT( sizeof(BinFloat) >= sizeof(float));
+        static_assert( sizeof(BinFloat) >= sizeof(float), "sizeof(BinFloat) >= sizeof(float)");
 
         #if defined( _MSC_VER)
             // If this assertion fails, Visual C++ has finally moved to ILP64. This means that this
             //  code has just become legacy code! Find out the current value of _MSC_VER and modify
             //  the #if above so it evaluates false on the current and all upcoming VC versions (or
             //  on the current platform, if LP64 or LLP64 are still used on other platforms).
-            BOOST_STATIC_ASSERT( sizeof(BinFloat) == sizeof(float));
+            static_assert( sizeof(BinFloat) == sizeof(float), "sizeof(BinFloat) == sizeof(float)");
 
             // This works best on Visual C++, but other compilers have their problems with it.
             const BinFloat binValue = reinterpret_cast<BinFloat const &>(pValue);