{"id":33158,"date":"2023-02-05T00:14:51","date_gmt":"2023-02-04T18:44:51","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-delegation-in-c\/"},"modified":"2023-02-05T00:14:51","modified_gmt":"2023-02-04T18:44:51","slug":"solved-delegation-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-delegation-in-c\/","title":{"rendered":"[Solved] Delegation in C++"},"content":{"rendered":"

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First, let’s use a typedef for the function:<\/p>\n

typedef int agechanger(int);\n<\/code><\/pre>\n
this makes a new type, agechanger<\/code>, which will be used in code for passing the function instances around.<\/p>\n
Now, you should give your person<\/code> class a proper constructor, and properly incapsulate the age<\/code> field providing a public getter. Then add a method that accepts a function as argument, function of type agechanger<\/code>, of course.<\/p>\n
class person\n{\nprivate:\n    int age;\npublic:\n    person(int age){\n        this->age = age;\n    }\n\n    int getAge() const {\n        return age;\n    }\n    void changeAge(agechanger f)\n    {\n        age = f(age);\n    }\n};\n<\/code><\/pre>\n
Then define a function that fits our type, inside a class<\/code>:<\/p>\n
class addNumber {\npublic:\n    static int changeAge(int arg) {\n        return arg + 1;\n    }\n};\n<\/code><\/pre>\n
Notice that the function is marked as static and returns the passed int<\/code> incremented by one.<\/p>\n
Let’s test everything in a main<\/code>:<\/p>\n
int main()\n{\n    person Olaf(100); \/\/instance of person, the old Olaf\n\n    Olaf.changeAge(addNumber::changeAge); \/\/pass the function to the person method\n\n    std::cout << Olaf.getAge() << std::endl; \/\/Olaf should be even older, now\n}\n<\/code><\/pre>\n
Let’s make and use a different function, ouside a class, this time:<\/p>\n
int younger(int age)\n{\n    return age -10;\n}\n\nint main(){\n\n    person Olaf(100);\n\n    Olaf.changeAge(younger);\n\n    std::cout << Olaf.getAge() << std::endl; \/\/ Olaf is much younger now!\n}\n<\/code><\/pre>\n
I hope that having code that works is going to help you understand things better. The topic you’re asking about, here, is generally considered advanced, while I think you should review some more basic topics of c++, first (functions<\/a> and classes<\/a>, for example).<\/p>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved Delegation in C++ <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] First, let’s use a typedef for the function: typedef int agechanger(int); this makes a new type, agechanger, which will be used in code for passing the function instances around. Now, you should give your person class a proper constructor, and properly incapsulate the age field providing a public getter. Then add a method that … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,2699],"class_list":["post-33158","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-delegation"],"yoast_head":"\n[Solved] Delegation in C++ - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-delegation-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Delegation in C++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First, let’s use a typedef for the function: typedef int agechanger(int); this makes a new type, agechanger, which will be used in code for passing the function instances around. 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