https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66287
Bug ID: 66287
Summary: [C++11] A constexpr variable of "const int* const&"
cannot be initialized
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kariya_mitsuru at hotmail dot com
Target Milestone: ---
Created attachment 35627
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35627&action=edit
g++ -v
Please see the sample code below.
=========== sample code ===========
constexpr const int& i = 42;
constexpr const int* const& p = &i;
int main() {}
=========== sample code ===========
================================== output ==================================
prog.cc:2:34: error: modification of '_ZGR1p1' is not a constant-expression
constexpr const int* const& p = &i;
^
================================== output ==================================
cf. http://melpon.org/wandbox/permlink/RfoewySFecAtfEOV
I think that "&i" is a valid constant expression.
Note that it is compiled successfully if the variable "i" is not a reference.
=========== sample code ===========
constexpr const int i = 42;
constexpr const int* const& p = &i;
int main() {}
=========== sample code ===========
cf. http://melpon.org/wandbox/permlink/qdLd3nqzteNRrnow
Note also that an rvalue reference causes the same error.
=========== sample code ===========
constexpr int&& i = 42;
constexpr int*&& p = &i;
int main() {}
=========== sample code ===========
================================== output ==================================
prog.cc:2:23: error: modification of '_ZGR1p1' is not a constant-expression
constexpr int*&& p = &i;
^
================================== output ==================================
cf. http://melpon.org/wandbox/permlink/TzS1T2dzyjSMxlKd
