{"id":32242,"date":"2023-01-27T15:16:32","date_gmt":"2023-01-27T09:46:32","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-does-the-stream-operator-exist-for-class-member-functions\/"},"modified":"2023-01-27T15:16:32","modified_gmt":"2023-01-27T09:46:32","slug":"solved-does-the-stream-operator-exist-for-class-member-functions","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-does-the-stream-operator-exist-for-class-member-functions\/","title":{"rendered":"[Solved] Does the stream operator exist for class member functions?"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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<\/div>\n
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It can be done easily like this:<\/p>\n

#include <iostream>\n\nclass A {\n  public:\n    std::ostream &debug() const {\n      std::cerr << \"[timestamp]\" << \"[DEBUG]\";\n      return std::cerr;   \n    }\n};\n\nint main()\n{\n    A a;\n    a.debug() << \"Test\";\n}\n<\/code><\/pre>\n
But the important question here is: Should we implement it in this way? In my opinion, NO!<\/strong><\/p>\n
Because you are thinking that the User of the class will print the logs like this:<\/p>\n
int main()\n{\n    A a;\n    a.debug() << \"Test\" << std::endl;\n    a.debug() << \"Test2\" << std::endl;\n}\n<\/code><\/pre>\n
Output:<\/p>\n
[timestamp][DEBUG]Test\n[timestamp][DEBUG]Test2\n<\/code><\/pre>\n
But what if User chooses this way:<\/p>\n
int main()\n{\n    A a;\n    auto &out = a.debug();\n    out << \"Test\" << std::endl;\n    out << \"Test2\" << std::endl;\n}\n<\/code><\/pre>\n
Output:<\/p>\n
[timestamp][DEBUG]Test\nTest2\n<\/code><\/pre>\n
I would highly recommend not to return stream object. You should use member functions for this purpose.<\/p>\n
#include <iostream>\n\nclass A {\n  public:\n    static void debug(const std::string &log) {\n      std::cerr << \"[timestamp]\" << \"[DEBUG]\" << log << std::endl;\n    }\n};\n\nint main()\n{\n    A::debug(\"Test 1\");\n    A::debug(\"Test 2\");\n}\n<\/code><\/pre>\n
Output:<\/p>\n
[timestamp][DEBUG]Test 1\n[timestamp][DEBUG]Test 2\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            1<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Does the stream operator exist for class member functions? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] It can be done easily like this: #include <iostream> class A { public: std::ostream &debug() const { std::cerr << “[timestamp]” << “[DEBUG]”; return std::cerr; } }; int main() { A a; a.debug() << “Test”; } But the important question here is: Should we implement it in this way? In my opinion, NO! Because you … 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":[324,547],"class_list":["post-32242","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-oop"],"yoast_head":"\n[Solved] Does the stream operator exist for class member functions? - 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-does-the-stream-operator-exist-for-class-member-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Does the stream operator exist for class member functions? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] It can be done easily like this: #include <iostream> class A { public: std::ostream &debug() const { std::cerr << "[timestamp]" << "[DEBUG]"; return std::cerr; } }; int main() { A a; a.debug() << "Test"; } But the important question here is: Should we implement it in this way? In my opinion, NO! Because you ... 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