https://bugs.llvm.org/show_bug.cgi?id=36850
Bug ID: 36850
Summary: std::copy_n requires non-overlapping inputs
Product: libc++
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: t.p.northo...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Created attachment 20096
--> https://bugs.llvm.org/attachment.cgi?id=20096&action=edit
Example of unexpected behaviour
Most of the "std::copy*" functions explicitly require their input and output
iterators not to overlap, but std::copy_n doesn't seem to.
However, the implementation of std::copy_n in libc++ forwards to a version of
std::copy which behaves differently than expected from a straightforward
reading of copy_n's effects clause and calls memmove.
This came up on IRC, where Eelis came up with the attached C++ file
demonstrating the difference from a naive copy_n.
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