Visual Studio 2017 version 15.3 and later (available with /std:c++17): A lambda expression may be declared as constexpr or used in a contant expression when the initialization of each data member that it captures or introduces is allowed within a constant expression.

    int y = 32;
	auto answer = [y]() constexpr 
	{
		int x = 10;
		return y + x; 
	};

    constexpr int Increment(int n) 
    {
	    return [n] { return n + 1; }();
    }

A lambda is implicitly constexpr if its result satisfies the requirements of a constexpr function:

	auto answer = [](int n) 
	{
		return 32 + n; 
	};

	constexpr int response = answer(10);

If a lambda is implicitly or explicitly constexpr, and you convert it to a function pointer, the resulting function is also constexpr:

	auto Increment = [](int n)
	{
		return n + 1;
	};

	constexpr int(*inc)(int) = Increment;

C++ Language Reference
Function Objects in the C++ Standard Library
Function Call
for_each