'Need help figuring out data type of declaration in C++ [duplicate]

I am following this tutorial. The following declaration found in main.cc has me stumped:

auto say_hello = [](const HttpRequest& request) -> HttpResponse {...}

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This is shown in the debugging window, but I don't quite get what it is. What is the data type represented by this auto keyword? What is the data type created by the square brackets after the equal sign? I suppose HttpResponse is not the return type of say_hello?

Thank you so much!!!

c++variablestypesauto


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