https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119855
Bug ID: 119855
Summary: cassert incompatible with new multidimensional index
operator in c++23
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: cianciosamr at ornl dot gov
Target Milestone: ---
The following C++23 code fails to compile
#include <cassert>
struct foo {
int operator[](int i, int j) {return 0;}
};
int main(int argc, const char * argv[]) {
foo f;
assert(f[0, 0] && "");
}
With the error
<source>:9:25: error: macro 'assert' passed 2 arguments, but takes just 1
9 | assert(f[0, 0] && "");
| ^
In file included from
/opt/compiler-explorer/gcc-trunk-20250417/include/c++/15.0.1/cassert:46,
from <source>:1:
/usr/include/assert.h:92:11: note: macro 'assert' defined here
92 | # define assert(expr)
\
| ^~~~~~
<source>: In member function 'int foo::operator[](int, int)':
<source>:4:24: warning: unused parameter 'i' [-Wunused-parameter]
4 | int operator[](int i, int j) {return 0;}
| ~~~~^
<source>:4:31: warning: unused parameter 'j' [-Wunused-parameter]
4 | int operator[](int i, int j) {return 0;}
| ~~~~^
<source>: In function 'int main(int, const char**)':
<source>:9:5: error: 'assert' was not declared in this scope
9 | assert(f[0, 0] && "");
| ^~~~~~
<source>:2:1: note: 'assert' is defined in header '<cassert>'; this is probably
fixable by adding '#include <cassert>'
1 | #include <cassert>
+++ |+#include <cassert>
2 |
<source>:8:9: warning: unused variable 'f' [-Wunused-variable]
8 | foo f;
| ^
<source>:7:14: warning: unused parameter 'argc' [-Wunused-parameter]
7 | int main(int argc, const char * argv[]) {
| ~~~~^~~~
<source>:7:33: warning: unused parameter 'argv' [-Wunused-parameter]
7 | int main(int argc, const char * argv[]) {
| ~~~~~~~~~~~~~^~~~~~
