function

问题 This is my code inside myCode.h : #include <set> using namespace std; bool MyObjectComp(const MyObject& lhs, const MyObject& rhs) { return lhs.mTick < rhs.mTick; } typedef std::multiset<MyObject, MyObjectComp> MyObjectMultiSet; but it says that function MyObjectComp is not a type name. Where should I place it? 回答1: The template parameter for std::multiset expects a type, MyObjectComp is not a type but is instead a function name. You can either use decltype to get its type like typedef std:

问题 I have table with tree structure, columns are id , category , parent_id Now I need a copy a node and its child's to a another node, while copying, the category must be same, but with new id and parent_id.. My input will be node to copy & destination node to copy I have explained the tree structure in the image file.. i need a function to do so.., PostgreSQL version 9.1.2 Column | Type | Modifiers -----------+---------+------------------------------------------------- id | integer | not null

问题 I have table with tree structure, columns are id , category , parent_id Now I need a copy a node and its child's to a another node, while copying, the category must be same, but with new id and parent_id.. My input will be node to copy & destination node to copy I have explained the tree structure in the image file.. i need a function to do so.., PostgreSQL version 9.1.2 Column | Type | Modifiers -----------+---------+------------------------------------------------- id | integer | not null

问题 I have an array. The array can contain 1 to 7 unique strings of day names. The day names will be in order from Mon to Sun. - eg: ["Tue", "Thu", "Sun"] I want to use javascript to sort that array so that the order will be beginning with today. ie: if today is Friday, then the sorted array should be ["Sun", "Tue", "Thu"] if today is Thursday then the sorted array should be ["Thu", "Sun", "Tue"] Can anyone help? 回答1: function sort_days(days) { To get today's day of week, use new Date().getDay()

问题 I am trying to create a PostgreSQL function where I will loop over the rows of a query and store some of them in an array, before doing more stuff with it. How can I create an array of rowtype? CREATE OR REPLACE FUNCTION forExample() RETURNS integer AS $BODY$ DECLARE r "WEBHOST"%rowtype; b "WEBHOST"%rowtype[]; <- This does not work !!! BEGIN FOR r IN SELECT * FROM "WEBHOST" LOOP array_append(b, r); END LOOP; RETURN 33; END $BODY$ LANGUAGE 'plpgsql'; The above function will be more complex,

问题 This question already has answers here : What are the advantages/disadvantages for creating a top level function in ES6 with arrows or without? (2 answers) Closed last year . I can't help but wondering if there's any advantage between using plain functions and fat arrows for React functional components const MyMainComponent = () => ( <main> <h1>Welcome to my app</h1> </main> ) function MyMainComponent() { return ( <main> <h1>Welcome to my app</h1> </main> ) } Both work of course perfectly

问题 This question already has answers here : What are the advantages/disadvantages for creating a top level function in ES6 with arrows or without? (2 answers) Closed last year . I can't help but wondering if there's any advantage between using plain functions and fat arrows for React functional components const MyMainComponent = () => ( <main> <h1>Welcome to my app</h1> </main> ) function MyMainComponent() { return ( <main> <h1>Welcome to my app</h1> </main> ) } Both work of course perfectly

问题 I'm having an issue with resolving issue with <forcedType> for stored function written in PL/pgSQL in my generated Routines. This question is more specific for solving problem I had already asked in this question and answer is partially provided in this Q&A. This is ONE of my user-defined functions in PL/pgSQL which I'm having issue with (I'm displaying only one since both functions have same RETURN TYPE and INPUT parameter ): create or replace function public.get_order_by_order_id(o_id

问题 I'm having an issue with resolving issue with <forcedType> for stored function written in PL/pgSQL in my generated Routines. This question is more specific for solving problem I had already asked in this question and answer is partially provided in this Q&A. This is ONE of my user-defined functions in PL/pgSQL which I'm having issue with (I'm displaying only one since both functions have same RETURN TYPE and INPUT parameter ): create or replace function public.get_order_by_order_id(o_id

问题 If I have a script like this: import sys def square(x): return x*x def cube(x): return x**3 How can I return a list of all the functions defined locally in the program ['square', 'cube'] , and not the ones imported. They are included when I try dir() but so are all the variables and other imported modules. I don't know what to put into dir to refer to the locally executing file. 回答1: l = [] for key, value in locals().items(): if callable(value) and value.__module__ == __name__: l.append(key)