{"id":1757,"date":"2021-02-22T14:25:36","date_gmt":"2021-02-22T19:25:36","guid":{"rendered":"http:\/\/www.jaimerios.com\/?p=1757"},"modified":"2025-12-02T23:37:28","modified_gmt":"2025-12-02T23:37:28","slug":"using-c-stdmerge","status":"publish","type":"post","link":"https:\/\/jaimerios.com\/?p=1757","title":{"rendered":"Using C++ std::merge"},"content":{"rendered":"\n

There have been a few times that I needed 2 vectors to be \u2026 merged<\/code>\u2026 and they had to be ordered.<\/p>\n\n\n\n

It’s simple when you have a plain old type, and are using the back_inserter<\/code> to append the contents of each vector to the end of the merged vector, but what if you want to use your custom class? And what if you need a custom means to sort the merged vector?<\/p>\n\n\n\n

You can use a predicate function to put the items in the correct order in the merged vector.<\/p>\n\n\n\n

The format for the predicate function is bool FunctionName(const T& a, const T& b)<\/code> where T is the custom type that you are working with.<\/p>\n\n\n\n

In the example I provide, I’m using a lambda, and the custom class is task<\/code>:<\/p>\n\n\n\n

C++<\/span><\/span>