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#1
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Syntax: typedef typename F:: template Code: template <class F, class X> struct twice { typedef typename F::template apply<X>::type once; // f(x) typedef typename F::template apply<once>::type type; // f(f(x)) }; |
#2
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Re: Syntax: typedef typename F:: template Its when "apply" is a meta-function of the class defined by F. We will have a tendency to write F::apply, but the syntax is F::template apply There is a brief explanation here: http://www.boost.org/doc/libs/1_40_0...her-order.html |
#3
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Re: Syntax: typedef typename F:: template Metaproduction function? Can you give me an example of code that apply |
#4
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Re: Syntax: typedef typename F:: template A meta-function is a function that applies to types. For example, you can define the meta-function AddPointer which skips the type int at "int*" like this: Code: struct AddPointer { template<typename T> struct apply { typedef T* type; }; }; int main() { typedef AddPointer::apply<int>::type TPInt; // And here TPInt is a pointer to int... return 0; } Code: int main() { AddPointer::apply<int>::type TPInt; // and here TPInt is a pointer to int... twice<AddPointer, int>::type TDPInt; return 0; } |
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Tags: cpp, syntax, template |
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