How to pass lambda to a lambda?

Question

I have not managed to find why this code does not work:

#include <iostream> #include <functional> using namespace std; int main() { auto xClosure = [](const function<void(int&)>& myFunction) { myFunction(10);}; xClosure([] (int& number) -> void {cout<<number<<endl; }); return 0; }

It returns:

g++ test.cc -o test -std=c++14

 test.cc:9:5: error: no matching function for call to object of type 'const function<void (int &)>'

Yakk - Adam Nevraumont · Accepted Answer · 2017-05-20 19:38:22Z

This has nothing to do with lambdas:

void test(const function<void(int&)>& myFunction) { myFunction(10); }

this fails to compile for the same reason; you cannot bind the literal 10 to an int&.

Maybe you meant

const function<void(int)>& myFunction

doing so and also modifying the signature of your lambda should make your code compile.

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