Function Pointers
Get introduced to the function pointers.
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Function pointers are for storing addresses of functions to execute those functions at a later time. Function pointers in D are similar to their counterparts in the C programming language.
Delegates store both a function pointer and the context to execute that function pointer in. The stored context can either be the scope that the function execution will occur or a struct or class object.
Delegates also enable closures, a concept that is supported by most functional programming languages.
Function pointers
In the previous chapter, you saw that it is possible to take addresses of functions with the &
operator. In one of those examples, we passed such an address to a function template.
Taking advantage of the fact that template type parameters can match any type, let’s pass a function pointer to a template to observe its type by printing its .stringof
property:
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