https://bugs.llvm.org/show_bug.cgi?id=43013
Bug ID: 43013
Summary: std::reduce(begin, end, init) does not accept init
with only move constructor
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: sei_yic...@outlook.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Created attachment 22380
--> https://bugs.llvm.org/attachment.cgi?id=22380&action=edit
repro
Overview: std::reduce(begin, end, init) could not be compiled with init only
have move constructor.
Steps to Reproduce: clang++ -o /dev/null -std=c++17 -c test.cc, test.cc
attched.
Actual Results:
$ clang++ -o /dev/null -std=c++17 -stdlib=libc++ -c test.cc
In file included from test.cc:3:
/home/yiyan/.local/bin/../include/c++/v1/numeric:196:43: error: call to
implicitly-deleted copy constructor of 'T'
return _VSTD::reduce(__first, __last, __init, _VSTD::plus<>());
^~~~~~
test.cc:17:10: note: in instantiation of function template specialization
'std::__1::reduce<T *, T>' requested here
std::reduce(t, t + 1, T(0));
^
test.cc:9:5: note: copy constructor is implicitly deleted because 'T' has a
user-declared move constructor
T(T &&); // MoveConstructible
^
/home/yiyan/.local/bin/../include/c++/v1/numeric:184:59: note: passing argument
to parameter '__init' here
reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp
__b)
^
1 error generated.
Expected Results: Compiled without error.
Build Date & Hardware: Build 2019-08-15 on Linux x86_64
Additional Information: I think std::reduce(begin, end, init) should be same
with std::reduce(begin, end, init, std::plus<>()), the former failed while the
latter passed.
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