definition

How to define an array of functions in C

六月ゝ 毕业季﹏ 提交于 2019-11-28 08:26:00
I have a struct that contains a declaration like this one: void (*functions[256])(void) //Array of 256 functions without arguments and return value And in another function I want to define it, but there are 256 functions! I could do something like this: struct.functions[0] = function0; struct.functions[1] = function1; struct.functions[2] = function2; And so on, but this is too tiring, my question is there some way to do something like this? struct.functions = { function0, function1, function2, function3, ..., }; EDIT : Syntax error corrected as said by Chris Lutz. I have a struct that contains

How to Define a MySql datasource bean via XML in Spring

為{幸葍}努か 提交于 2019-11-28 07:37:21
I've looked over the documentation to define a bean. I'm just unclear on what class file to use for a Mysql database. Can anyone fill in the bean definition below? <bean name="dataSource" class=""> <property name="driverClassName" value="" /> <property name="url" value="mysql://localhost/GameManager" /> <property name="username" value="gamemanagertest" /> <property name="password" value="1" /> </bean> Both the answers are appropriate for the question. But just for an FYI if you're going to use DriverManagerDataSource as your datasource, every call to your datasource bean will create a new

Spring - using static final fields (constants) for bean initialization

柔情痞子 提交于 2019-11-28 03:44:52
is it possible to define a bean with the use of static final fields of CoreProtocolPNames class like this: <bean id="httpParamBean" class="org.apache.http.params.HttpProtocolParamBean"> <constructor-arg ref="httpParams"/> <property name="httpElementCharset" value="CoreProtocolPNames.HTTP_ELEMENT_CHARSET" /> <property name="version" value="CoreProtocolPNames.PROTOCOL_VERSION"> </bean> public interface CoreProtocolPNames { public static final String PROTOCOL_VERSION = "http.protocol.version"; public static final String HTTP_ELEMENT_CHARSET = "http.protocol.element-charset"; } If it is possible,

Selecting entire function definition in Vim

非 Y 不嫁゛ 提交于 2019-11-28 03:33:35
I've been trying Vim for any text editing work for almost a week now. I want to know the fastest way to select a C function definition. For example, if I have a function like this: void helloworlds( int num ) { int n; for ( n = 0; n < num; ++n ) { printf( "Hello World!\n" ); } } How would I be able to delete the whole definition including the function name? David Cain As is common in Vim, there are a bunch of ways! Note that the first two solutions depend on an absence of blank lines. If your cursor is on the line with the function name, try d } . It will delete everything to the next block (i

What are the advantages and disadvantages of separating declaration and definition as in C++?

痴心易碎 提交于 2019-11-28 03:15:20
问题 In C++, declaration and definition of functions, variables and constants can be separated like so: function someFunc(); function someFunc() { //Implementation. } In fact, in the definition of classes, this is often the case. A class is usually declared with it's members in a .h file, and these are then defined in a corresponding .C file. What are the advantages & disadvantages of this approach? 回答1: Historically this was to help the compiler. You had to give it the list of names before it

What is the definition of “accessor method”?

非 Y 不嫁゛ 提交于 2019-11-28 02:42:28
问题 I've been having an argument about the usage of the word "accessor" (the context is Java programming). I tend to think of accessors as implicitly being "property accessors" -- that is, the term implies that it's more or less there to provide direct access to the object's internal state. The other party insists that any method that touches the object's state in any way is an accessor. I know you guys can't win the argument for me, but I'm curious to know how you would define the term. :) 回答1:

Undefined reference error for static constexpr member

*爱你&永不变心* 提交于 2019-11-28 02:37:25
问题 Consider this code: #include <vector> struct A { static constexpr int kDefaultValue = -1; std::vector<int> v; A(int n): v(n, A::kDefaultValue) {} }; int main() { A(10); return 0; } It fails to link (llvm clang, gcc 4.9, both on OS X): Undefined symbols for architecture x86_64: "A::kDefaultValue", referenced from: A::(int) in main.cpp.o ld: symbol(s) not found for architecture x86_64 The question is what's wrong with it? It can be fixed by static_cast -ing A::kDefaultValue to int . Or by

What is boilerplate code?

拈花ヽ惹草 提交于 2019-11-28 02:31:54
A coworker had never heard of this, and I couldn't provide a real definition. For me, it's always been an instance of 'I-know-it-when-I-see-it'. Bonus question, who originated the term? "boilerplate code" is any seemingly repetitive code that shows up again and again in order to get some result that seems like it ought to be much simpler. It's a subjective definition. The term comes from "boilerplate" in the newspaper industry: wiki NealB On the etymology the term boilerplate : from http://www.takeourword.com/Issue009.html ... Interestingly, the term arose from the newspaper business. Columns

Find where a variable is defined in PHP (And/or SMARTY)?

≯℡__Kan透↙ 提交于 2019-11-28 00:12:40
问题 I'm currently working on a very large project, and am under a lot of pressure to finish it soon, and I'm having a serious problem. The programmer who wrote this last defined variables in a very odd way - the config variables aren't all in the same file, they're spread out across the entire project of over 500 files and 100k+ lines of code, and I'm having a hell of a time figuring out where a certain variable is, so I can fix an issue. Is there a way to track this variable down? I believe he's

Defining function without the brackets?

寵の児 提交于 2019-11-27 23:43:17
I understand that my question might sound stupid, and that there might be something in the language definition that explicitly prohibits this notion, but since I don't know about this prohibition, I was wondering whether someone could shed some light on it. In short, I would like to define a python function that I could call from the python shell, but I would like to avoid the brackets. There are cases when a function does not require an argument, and then the bracket only seems to indicate that we are dealing with a function. Such an example would be, if one wants to print the current working