[libc++][vector] Make constructor vector(count, value, allocator) exception-safe

mtezych · mtezych · commit 7ff58b52a916 · 2024-02-16T23:43:34.000+03:00
diff --git a/libcxx/include/vector b/libcxx/include/vector
@@ -433,10 +433,12 @@ public:
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
   vector(size_type __n, const value_type& __x, const allocator_type& __a)
       : __end_cap_(nullptr, __a) {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     if (__n > 0) {
       __vallocate(__n);
       __construct_at_end(__n, __x);
     }
+    __guard.__complete();
   }
 
   template <class _InputIterator,

Original file line number	Diff line number	Diff line change
`@@ -433,10 +433,12 @@ public:`
`433`	`433`	`_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI`
`434`	`434`	`vector(size_type __n, const value_type& __x, const allocator_type& __a)`
`435`	`435`	`: __end_cap_(nullptr, __a) {`
	`436`	`+ auto __guard = std::__make_exception_guard(__destroy_vector(*this));`
`436`	`437`	`if (__n > 0) {`
`437`	`438`	`__vallocate(__n);`
`438`	`439`	`__construct_at_end(__n, __x);`
`439`	`440`	`}`
	`441`	`+ __guard.__complete();`
`440`	`442`	`}`
`441`	`443`
`442`	`444`	`template <class _InputIterator,`