# Allows this data structure to compile with C++ exceptions disabled.

--- a/interval_heap.hpp
+++ b/interval_heap.hpp
@@ -45,7 +45,7 @@
 #if (BOOST_HEAP_INTERVAL_HEAP_USE_STD_THREAD == true)
 #include <thread>
 #endif
-
+#include "../../src/mkxp-polyfill.h"
 namespace boost {
 namespace heap {
 //------------------------------User-Accessible---------------------------------
@@ -356,7 +356,7 @@ Iterator is_interval_heap_until (Iterator first, Iterator last, Compare compare)
 
   Offset index = static_cast<Offset>(0);
 
-  try {
+  MKXPZ_TRY {
     Offset index_end = last - first;
     while (index < index_end) {
       Iterator cursor = first + index;
@@ -378,7 +378,7 @@ Iterator is_interval_heap_until (Iterator first, Iterator last, Compare compare)
       }
       ++index;
     }
-  } catch (...) {
+  } MKXPZ_CATCH (...) {
     return first + index;
   }
   return last;
@@ -391,10 +391,10 @@ Iterator is_interval_heap_until (Iterator first, Iterator last, Compare compare)
 ///   Does not throw.
 template <typename Iterator, typename Compare>
 bool is_interval_heap (Iterator first, Iterator last, Compare compare) {
-  try {
+  MKXPZ_TRY {
     return (is_interval_heap_until<Iterator,Compare>(first, last, compare)
             == last);
-  } catch (...) {
+  } MKXPZ_CATCH (...) {
     return false;
   }
 }
@@ -562,7 +562,7 @@ void sift_up (Iterator first, Offset origin, Compare compare,Offset limit_child)
   Value limbo = std::move_if_noexcept(*(first + index));
 #endif
 //  Provides strong exception-safety guarantee (rollback), unless move throws.
-  try {
+  MKXPZ_TRY {
     while (index >= limit_child) {
       const Offset parent = ((index / 2 - 1) | 1) ^ (left_bound ? 1 : 0);
 #if (__cplusplus >= 201103L)  //  C++11
@@ -578,7 +578,7 @@ void sift_up (Iterator first, Offset origin, Compare compare,Offset limit_child)
       } else
         break;
     }
-  } catch (...) { //  Provides strong exception-safety guarantee.
+  } MKXPZ_CATCH (...) { //  Provides strong exception-safety guarantee.
 //  I need limbo because elements are being moved in the direction of travel.
 #if (__cplusplus < 201103L)  //  Not C++11. Need to allocate limbo.
     Value limbo;
@@ -589,7 +589,7 @@ void sift_up (Iterator first, Offset origin, Compare compare,Offset limit_child)
       origin = ((origin / 2 - 1) | 1) ^ (left_bound ? 1 : 0);
       swap(*(first + origin), limbo);
     }
-    throw;  //  Re-throw the current exception.
+    MKXPZ_RETHROW;  //  Re-throw the current exception.
   }
 #if (__cplusplus >= 201103L)  //  C++11
 //  Done sifting. Get the element out of limbo.
@@ -680,20 +680,20 @@ void sift_down (Iterator first, Iterator last, Offset origin, Compare compare,
 //  One past the last element with two children.
   const Offset end_parent = index_end / 2 -
                               ((left_bound && ((index_end & 3) == 0)) ? 2 : 1);
-  try { //  This try-catch block rolls back after exceptions.
+  MKXPZ_TRY { //  This try-catch block rolls back after exceptions.
     while (index < end_parent) {
       Offset child = index * 2 + (left_bound ? 2 : 1);
 //  If compare throws, heap property cannot be verified or enforced.
-      try { //  This try-catch block ensures no element is left in limbo.
+      MKXPZ_TRY { //  This try-catch block ensures no element is left in limbo.
         if (compare(*(first + child + (left_bound ? 2 : 0)),
                     *(first + child + (left_bound ? 0 : 2))))
           child += 2;
-      } catch (...) {
+      } MKXPZ_CATCH (...) {
 #if (__cplusplus >= 201103L)  //  C++11
 //  Pull the moving element out of limbo, to avoid leaks.
         *(first + index) = std::move_if_noexcept(limbo);
 #endif
-        throw;  //  Re-throw the current exception.
+        MKXPZ_RETHROW;  //  Re-throw the current exception.
       }
 #if (__cplusplus >= 201103L)  //  C++11
       *(first + index) = std::move_if_noexcept(*(first + child));
@@ -711,14 +711,14 @@ void sift_down (Iterator first, Iterator last, Offset origin, Compare compare,
         if (!left_bound && (cochild != index_end)) {
 //  Calculating this outside the if-statement simplifies exception-handling.
           bool swap_required;
-          try {
+          MKXPZ_TRY {
             swap_required = compare(*(first + child), *(first + cochild));
-          } catch (...) {
+          } MKXPZ_CATCH (...) {
 //  Pull the moving element out of limbo.
 #if (__cplusplus >= 201103L)
             *(first + index) = std::move_if_noexcept(limbo);
 #endif
-            throw;  //  Re-throw the current exception.
+            MKXPZ_RETHROW;  //  Re-throw the current exception.
           }
           if (swap_required) {
             //++child;
@@ -752,14 +752,14 @@ void sift_down (Iterator first, Iterator last, Offset origin, Compare compare,
     else
       sift_leaf_max<Iterator, Offset, Compare>(first, last, index, compare,
                                                limit_child);
-  } catch (...) {
+  } MKXPZ_CATCH (...) {
 //  Rolls back comparison exceptions. Move exceptions can't be reliably fixed.
     while (index > origin) {
       const Offset parent = ((index / 2 - 1) | 1) ^ (left_bound ? 1 : 0);
       swap(*(first + parent), *(first + index));
       index = parent;
     }
-    throw;  //  Re-throw the current exception.
+    MKXPZ_RETHROW;  //  Re-throw the current exception.
   }
 }