https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106926
Bug ID: 106926
Summary: string_view construction from literal string
containing null/zero should warn
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jzwinck at gmail dot com
Target Milestone: ---
This code compiles but does something the programmer almost certainly does not
want:
#include <string_view>
constexpr std::string_view sv = "four\0nine"; // 9 bytes of data
static_assert(sv.size() == 4); // required by C++, but surprising
GCC can't implement what the programmer intended, so it should warn if a
string_view is constructed or assigned from a string literal which contains
null bytes before the end.
When this happens, the rest of the string literal data is still accessible but
only if you know it's there by some other means. I expect such usage to be
very rare, so warning about it even at -Wall seems reasonable. Even if the
warning only comes with -Wextra that would be better than silence.
