Does c++ standard support non-const data member being as array bounds? -


see following code:

class x {     int a; public:     void foo() {         char arr[a]; // not constant variable, g++ doesn't report error, why?     } };

i thought constant expression can used in array bounds, until today met strange code above. both g++ , clang++ can compile successfully. can't find description in c++ standard supporting it. extented content of compiler? , can find description it?

no, c++ standard doesn't support vla


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