From f32cb2f6965071ff1e9ee4977234674af2727dc7 Mon Sep 17 00:00:00 2001
From: Abhay Kumar <jarvis@Abhays-MacBook-Air.local>
Date: Fri, 6 Jun 2025 14:23:26 +0530
Subject: [PATCH] :bug: Fix bit_ceil() to return 1 for input 0 as per
 specification

---
 include/boost/core/bit.hpp | 4 ++--
 test/bit_ceil_test.cpp     | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/boost/core/bit.hpp b/include/boost/core/bit.hpp
index 7520abf..dfc2ab2 100644
--- a/include/boost/core/bit.hpp
+++ b/include/boost/core/bit.hpp
@@ -703,7 +703,7 @@ BOOST_CXX14_CONSTEXPR inline boost::uint32_t bit_ceil_impl( boost::uint32_t x )
 {
     if( x == 0 )
     {
-        return 0;
+        return 1;
     }
 
     --x;
@@ -723,7 +723,7 @@ BOOST_CXX14_CONSTEXPR inline boost::uint64_t bit_ceil_impl( boost::uint64_t x )
 {
     if( x == 0 )
     {
-        return 0;
+        return 1;
     }
 
     --x;
diff --git a/test/bit_ceil_test.cpp b/test/bit_ceil_test.cpp
index fbb81d4..1b6af0d 100644
--- a/test/bit_ceil_test.cpp
+++ b/test/bit_ceil_test.cpp
@@ -21,7 +21,7 @@ template<class T> void test_bit_ceil( T x )
 
     if( x == 0 )
     {
-        BOOST_TEST_EQ( y, 0 );
+        BOOST_TEST_EQ( y, 1 );
     }
     else
     {