Index: boost/test/floating_point_comparison.hpp
===================================================================
--- boost/test/floating_point_comparison.hpp	(revision 49167)
+++ boost/test/floating_point_comparison.hpp	(working copy)
@@ -200,10 +200,12 @@
     // Public typedefs
     typedef bool result_type;
 
+    check_is_close_t() { }
+
     template<typename FPT, typename ToleranceBaseType>
     bool
     operator()( FPT left, FPT right, percent_tolerance_t<ToleranceBaseType> tolerance, 
-                floating_point_comparison_type fpc_type = FPC_STRONG )
+                floating_point_comparison_type fpc_type = FPC_STRONG ) const
     {
         close_at_tolerance<FPT> pred( tolerance, fpc_type );
 
@@ -212,7 +214,7 @@
     template<typename FPT, typename ToleranceBaseType>
     bool
     operator()( FPT left, FPT right, fraction_tolerance_t<ToleranceBaseType> tolerance, 
-                floating_point_comparison_type fpc_type = FPC_STRONG )
+                floating_point_comparison_type fpc_type = FPC_STRONG ) const
     {
         close_at_tolerance<FPT> pred( tolerance, fpc_type );
 
@@ -221,7 +223,7 @@
 };
 
 namespace {
-check_is_close_t check_is_close;
+check_is_close_t const check_is_close;
 }
 
 //____________________________________________________________________________//
@@ -234,16 +236,18 @@
     // Public typedefs
     typedef bool result_type;
 
+    check_is_small_t() { }
+
     template<typename FPT>
     bool
-    operator()( FPT fpv, FPT tolerance )
+    operator()( FPT fpv, FPT tolerance ) const
     {
         return tt_detail::fpt_abs( fpv ) < tt_detail::fpt_abs( tolerance );
     }
 };
 
 namespace {
-check_is_small_t check_is_small;
+check_is_small_t const check_is_small;
 }
 
 //____________________________________________________________________________//