definition

What exactly is One Definition Rule in C++?

由 霸气de小男生 提交于 2019-11-25 22:49:09
问题 What exactly does One Definition Rule in C++ say? The only trustworthy occurence I can find is in The C++ Programming Language, 3rd. ed., P. 9.2.3 . Is there any official definition of the rule except that? 回答1: The truth is in the standard (3.2 One definition rule) : No translation unit shall contain more than one definition of any variable, function, class type, enumeration type or template. [...] Every program shall contain exactly one definition of every non-inline function or object that

What exactly is RESTful programming?

由 …衆ロ難τιáo~ 提交于 2019-11-25 22:16:56
问题 What exactly is RESTful programming? 回答1: An architectural style called REST (Representational State Transfer) advocates that web applications should use HTTP as it was originally envisioned . Lookups should use GET requests. PUT, POST, and DELETE requests should be used for mutation, creation, and deletion respectively . REST proponents tend to favor URLs, such as http://myserver.com/catalog/item/1729 but the REST architecture does not require these "pretty URLs". A GET request with a

What is 'Currying'?

由 情到浓时终转凉″ 提交于 2019-11-25 22:16:35
问题 I\'ve seen references to curried functions in several articles and blogs but I can\'t find a good explanation (or at least one that makes sense!) 回答1: Currying is when you break down a function that takes multiple arguments into a series of functions that each take only one argument. Here's an example in JavaScript: function add (a, b) { return a + b; } add(3, 4); // returns 7 This is a function that takes two arguments, a and b, and returns their sum. We will now curry this function:

Definition of “downstream” and “upstream”

由 穿精又带淫゛_ 提交于 2019-11-25 22:15:06
问题 I\'ve started playing with Git and have come across the terms \"upstream\" and \"downstream\". I\'ve seen these before but never understood them fully. What do these terms mean in the context of SCMs (Software Configuration Management tools) and source code? 回答1: In terms of source control, you're " downstream " when you copy (clone, checkout, etc) from a repository. Information flowed "downstream" to you. When you make changes, you usually want to send them back " upstream " so they make it

Defining static const integer members in class definition

由 ⅰ亾dé卋堺 提交于 2019-11-25 21:07:41
My understanding is that C++ allows static const members to be defined inside a class so long as it's an integer type. Why, then, does the following code give me a linker error? #include <algorithm> #include <iostream> class test { public: static const int N = 10; }; int main() { std::cout << test::N << "\n"; std::min(9, test::N); } The error I get is: test.cpp:(.text+0x130): undefined reference to `test::N' collect2: ld returned 1 exit status Interestingly, if I comment out the call to std::min, the code compiles and links just fine (even though test::N is also referenced on the previous line
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