Guard to be used only when they are available

zibi2 · zibi2 · commit a83b5caf569b · 2024-10-31T12:08:18.000Z
diff --git a/libcxx/include/__utility/small_buffer.h b/libcxx/include/__utility/small_buffer.h
@@ -61,6 +61,7 @@ class __small_buffer {
       return *std::launder(reinterpret_cast<_Stored**>(__buffer_));
   }
 
+#  ifdef _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION
   template <class _Stored>
   _LIBCPP_HIDE_FROM_ABI _Stored* __alloc() {
     if constexpr (__fits_in_buffer<_Stored>) {
@@ -72,11 +73,14 @@ class __small_buffer {
     }
   }
 
+#  endif // _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION
+#  ifdef _LIBCPP_HAS_LIBRARY_SIZED_DEALLOCATION
   template <class _Stored>
   _LIBCPP_HIDE_FROM_ABI void __dealloc() noexcept {
     if constexpr (!__fits_in_buffer<_Stored>)
       ::operator delete[](*reinterpret_cast<void**>(__buffer_), sizeof(_Stored), align_val_t{alignof(_Stored)});
   }
+#  endif // _LIBCPP_HAS_LIBRARY_SIZED_DEALLOCATION
 
   template <class _Stored, class... _Args>
   _LIBCPP_HIDE_FROM_ABI void __construct(_Args&&... __args) {

Original file line number	Diff line number	Diff line change
`@@ -61,6 +61,7 @@ class __small_buffer {`
`61`	`61`	`return std::launder(reinterpret_cast<_Stored*>(__buffer_));`
`62`	`62`	`}`
`63`	`63`
	`64`	`+# ifdef _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION`
`64`	`65`	`template <class _Stored>`
`65`	`66`	`_LIBCPP_HIDE_FROM_ABI _Stored* __alloc() {`
`66`	`67`	`if constexpr (__fits_in_buffer<_Stored>) {`
`@@ -72,11 +73,14 @@ class __small_buffer {`
`72`	`73`	`}`
`73`	`74`	`}`
`74`	`75`
	`76`	`+# endif // _LIBCPP_HAS_LIBRARY_ALIGNED_ALLOCATION`
	`77`	`+# ifdef _LIBCPP_HAS_LIBRARY_SIZED_DEALLOCATION`
`75`	`78`	`template <class _Stored>`
`76`	`79`	`_LIBCPP_HIDE_FROM_ABI void __dealloc() noexcept {`
`77`	`80`	`if constexpr (!__fits_in_buffer<_Stored>)`
`78`	`81`	`::operator delete[](reinterpret_cast<void*>(__buffer_), sizeof(_Stored), align_val_t{alignof(_Stored)});`
`79`	`82`	`}`
	`83`	`+# endif // _LIBCPP_HAS_LIBRARY_SIZED_DEALLOCATION`
`80`	`84`
`81`	`85`	`template <class _Stored, class... _Args>`
`82`	`86`	`_LIBCPP_HIDE_FROM_ABI void __construct(_Args&&... __args) {`