Author
anonymous
about 3 years ago
C++
clang 12.0.1
Author
anonymous
about 3 years ago
$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.78.0-clang-12.0.1/include -std=gnu++2b -pedantic -Wconversionprog.cc:2:40: warning: variable 't' is uninitialized when used here [-Wuninitialized]
constexpr T f() { T t/* = 10*/; return t; };
^
prog.cc:6:23: note: in instantiation of function template specialization 'f<int>' requested here
constexpr int z = f<int>(); // error
^
prog.cc:2:22: note: initialize the variable 't' to silence this warning
constexpr T f() { T t/* = 10*/; return t; };
^
= 0
prog.cc:6:19: error: constexpr variable 'z' must be initialized by a constant expression
constexpr int z = f<int>(); // error
^ ~~~~~~~~
prog.cc:2:40: note: read of uninitialized object is not allowed in a constant expression
constexpr T f() { T t/* = 10*/; return t; };
^
prog.cc:6:23: note: in call to 'f()'
constexpr int z = f<int>(); // error
^
1 warning and 1 error generated.