[libcxx-commits] [libcxx] 844a9c0 - [libc++] Make common_iterator's proxy types into aggregates.
Arthur O'Dwyer via libcxx-commits
libcxx-commits at lists.llvm.org
Mon Mar 7 12:44:43 PST 2022
Author: Arthur O'Dwyer
Date: 2022-03-07T15:44:10-05:00
New Revision: 844a9c0ef4543bb8d41e56290d47ea0a80fb110b
URL: https://github.com/llvm/llvm-project/commit/844a9c0ef4543bb8d41e56290d47ea0a80fb110b
DIFF: https://github.com/llvm/llvm-project/commit/844a9c0ef4543bb8d41e56290d47ea0a80fb110b.diff
LOG: [libc++] Make common_iterator's proxy types into aggregates.
Saves one move in each case, which is basically nothing perf-wise;
this is more about simplifying the code.
Differential Revision: https://reviews.llvm.org/D121130
Added:
Modified:
libcxx/include/__iterator/common_iterator.h
Removed:
################################################################################
diff --git a/libcxx/include/__iterator/common_iterator.h b/libcxx/include/__iterator/common_iterator.h
index abbd8f4038fb4..29dfabff8a885 100644
--- a/libcxx/include/__iterator/common_iterator.h
+++ b/libcxx/include/__iterator/common_iterator.h
@@ -37,31 +37,18 @@ concept __can_use_postfix_proxy =
template<input_or_output_iterator _Iter, sentinel_for<_Iter> _Sent>
requires (!same_as<_Iter, _Sent> && copyable<_Iter>)
class common_iterator {
- class __proxy {
- friend common_iterator;
-
- iter_value_t<_Iter> __value;
- // We can move __x because the only caller verifies that __x is not a reference.
- constexpr explicit __proxy(iter_reference_t<_Iter>&& __x)
- : __value(_VSTD::move(__x)) {}
-
- public:
+ struct __proxy {
constexpr const iter_value_t<_Iter>* operator->() const noexcept {
- return _VSTD::addressof(__value);
+ return _VSTD::addressof(__value_);
}
+ iter_value_t<_Iter> __value_;
};
- class __postfix_proxy {
- friend common_iterator;
-
- iter_value_t<_Iter> __value;
- constexpr explicit __postfix_proxy(iter_reference_t<_Iter>&& __x)
- : __value(_VSTD::forward<iter_reference_t<_Iter>>(__x)) {}
-
- public:
+ struct __postfix_proxy {
constexpr const iter_value_t<_Iter>& operator*() const noexcept {
- return __value;
+ return __value_;
}
+ iter_value_t<_Iter> __value_;
};
public:
@@ -133,7 +120,7 @@ class common_iterator {
auto&& __tmp = *_VSTD::__unchecked_get<_Iter>(__hold_);
return _VSTD::addressof(__tmp);
} else {
- return __proxy(*_VSTD::__unchecked_get<_Iter>(__hold_));
+ return __proxy{*_VSTD::__unchecked_get<_Iter>(__hold_)};
}
}
@@ -152,7 +139,7 @@ class common_iterator {
!__can_use_postfix_proxy<_Iter>) {
return _VSTD::__unchecked_get<_Iter>(__hold_)++;
} else {
- __postfix_proxy __p(**this);
+ auto __p = __postfix_proxy{**this};
++*this;
return __p;
}
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