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  1. #include <iostream>
  2.  
  3. struct Foo {
  4. 	static constexpr const auto lambda = [](){return 42;};
  5.  
  6. 	template<class U = decltype(lambda)>
  7. 	void func(U u = lambda) { std::cout << u();}
  8. };
  9.  
  10. int main() {
  11. 	Foo f;
  12. 	f.func();
  13. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:4:30: error: ‘constexpr const Foo::__lambda0 Foo::lambda’, declared using local type ‘const Foo::__lambda0’, is used but never defined [-fpermissive]
  static constexpr const auto lambda = [](){return 42;};
                              ^
stdout
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Standard output is empty
https://ideone.com/WDVc9f
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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