War heroes, like Paul Revere, are well known. However, there are also war heroes that a lot of people have never heard of. Unheralded as they maybe, they are worthy of commendation for very few people are willing to endure what these 25 war heroes you probably never heard of have endured. Subscribe to List25.
Lambda calculus. Lambda calculus (also written as Î»-calculus) is a formal system in mathematical logic for expressing computation based on function abstraction and application using variable binding and substitution.
It is supported in many other programming languages as well, such as R, Python, and C#. The lambda function can be usually used as a function pointer or delegate where it is very easy to pass a function as a function parameter or return a function as a type. Now, lets define the first lambda in C++11. auto p = [](int x, int y) { return x + y; }; So, the variable p is the lambda function, and you can use it like a normal function.