c++ - Lambda as default argument fails -


i error latest versions of clang , gcc code:

int main() {     auto lambda = [] (auto = [] {}) {};     lambda(); }

clang gives error:

prog.cc: in function 'int main()': prog.cc:3:12: error: no match call '(main()::<lambda(auto:1)>) ()'      lambda();             ^ prog.cc:2:35: note: candidate: template<class auto:1> main()::<lambda(auto:1)>      auto lambda = [] (auto = [] {}) {};                                    ^ prog.cc:2:35: note:   template argument deduction/substitution failed: prog.cc:3:12: note:   couldn't deduce template parameter 'auto:1'      lambda();             ^

why fail?

type deduction auto not consider default arguments.


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