TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 76

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 76', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Bind Header boost The Bind library creates function objects that bind to a function free function or member function . Rather than supplying all of the arguments to the function directly arguments can be delayed meaning that a binder can be used to create a function object with changed arity number of arguments for the function it binds to or to reorder the arguments any way you like. The return types of the overloaded versions of the function bind are unspecifiedthat is there is no guarantee for what the signature of a returned function object is. Sometimes you need to store that object somewhere rather than just passing it directly to another functionwhen this need arises you want to use which is covered in Library 11 Function 11. The key to understanding what the bind-functions return is to grok the transformation that is taking place. Using one of the overloaded bind functionstemplate class R class F unspecified-1 bind F f as an example this would be quoting from the online documentation A function object l such that the expression l v1 v2 . vm is equivalent to f implicitly converted to R. Thus the function that is bound is stored inside the binder and the result of subsequent invocations on that function object yields the return value from the function if any that is the template parameter R. The implementation that we re covering here supports up to nine function arguments. The implementation of Bind involves a number of functions and classes but as users we do not directly use anything other than the overloaded function bind. All binding takes place through the bind function and we can never depend on the type of the return value. When using bind the placeholders for arguments called _1 _2 and so on do not need to be introduced with a using declaration or directive because they reside in an unnamed namespace. Thus there is rarely a reason for writing one of the following lines when using . using boost bind using namespace .

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