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1. Top results related to where can a function be defined in c?

   • Can a static function be called through a function pointer in C?

     Top Answer

     Answered Nov 05, 2011 · 42 votes

     Yes, you can export static functions by handing out pointers to them. This is a common means of implementing the Factory pattern in C, where you can hide the implementations of a whole bunch of functions from the modules that use them, and have a FuncPtr_t GetFunction( enum whichFunctionIWant) that hands them out to consumers. That's how many dynamic linking implementations work.

     Other Answers

     Answered Nov 05, 2011 · 11 votes

     However, if I somehow manage to get a pointer to this function into another file, can I then call this function from that file.

     Yes, it's perfectly possible. The function isn't visible to the linker, but it's there in the executable. You can always jump to its address.

     I am not sure about scenarios though. Maybe you want others to only call your function after they called some other function (non-static of course). So you have them obtain it, and then they can call it.

     Other Answers

     Answered Nov 05, 2011 · 6 votes

     As the other mentioned, you can do it. An example of why you might want to is for some sort of "driver". You might pass back a structure containing the open, close, read, and write functions without having to make the actual functions publicly accessible.

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     1/5

   • Can a script be set as a parameter of a function in c# Unity?

     Top Answer

     Answered Mar 03, 2023 · 1 votes

     That's OOP basics - In such a case you have mainly two options:

     You should have

     public interface IDamageable{ void TakeDamage(float damage);}

     public class PlayerAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm a player and do a certain thing when I take {damage} amount of damage"); }}public class EnemyAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm an enmy and do something completely different when I take {damage} amount of damage"); }}

     // Careful with this naming in that case!public class Damageable : MonoBehaviour{ virtual void TakeDamage(float damage) { Debug.Log("This is the common default behavior for my inheritors - except the overwrite or extend it"); }}

     public class PlayerAnimator : Damageable { public override void TakeDamage(float damage) { // First call the default implementation base.TakeDamage(damage); Debug.Log($"I'm a player and do some additional stuff"); }}public class EnemyAnimator : Damageable { public override void TakeDamage(float damage) { Debug.Log($"I'm an enmy and decided to not do the default thing but something completely different"); }}

     • an interface if it is only about having the same method signatures but completely different behavior public interface IDamageable{ void TakeDamage(float damage);}And then public class PlayerAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm a player and do a certain thing when I take {damage} amount of damage"); }}public class EnemyAnimator : MonoBehaviour, IDamageable{ public void TakeDamage(float damage) { Debug.Log($"I'm an enmy and do something completely different when I take {damage} amount of damage"); }}
     • go through inheritance and have a common parent class which already implements common behavior and can then be extended - if needed at all // Careful with this naming in that case!public class Damageable : MonoBehaviour{ virtual void TakeDamage(float damage) { Debug.Log("This is the common default behavior for my inheritors - except the overwrite or extend it"); }}and public class PlayerAnimator : Damageable { public override void TakeDamage(float damage) { // First call the default implementation base.TakeDamage(damage); Debug.Log($"I'm a player and do some additional stuff"); }}public class EnemyAnimator : Damageable { public override void TakeDamage(float damage) { Debug.Log($"I'm an enmy and decided to not do the default thing but something completely different"); }}Here if you don't need any different behavior between EnemyAnimator and PlayerAnimator the answer would be easy: Just stick to a single class then!

     And then I would go

     public void Attack(){ _animator.SetTrigger("Attack");- var hitEnemies = Physics2D.OverlapCircleAll(_attackPoint.position, _attackRange, _enemyLayer); foreach (Collider2D enemy in hitEnemies) { // OPTION A if(enemy.TryGetComponent<IDamagable>(out var damageable)) // or OPTION B //if(enemy.TryGetComponent<Damagable>(out var damageable)) { damageable.TakeDamage(_attackDamage) } }}

     Check all answers on Stack Overflow

     2/5

   • Where Isolate can be defined in Flutter? How to start a thread in Flutter?

     Top Answer

     Answered Mar 17, 2021 · 3 votes

     You should read https://dev.to/alphamikle/why-should-you-use-isolates-in-flutter-1k5o, and look at package:isolates.

     The article contrasts using main thread, compute, Isolate proper, and the isolates package, with advantages and disadvantages of each. Best article I've seen in a long time.

     Also keep in mind, Java threads are data-shared, leading to possible deadlocks. Dart isolates are share-nothing, using "ports" to carefully move data between isolates, and no need for locking!

     Check all answers on Stack Overflow

     3/5

   • In how many ways can a function be invoked(called) in C++?

     Top Answer

     Answered Feb 24, 2015 · 2 votes

     Arbitrary functions can be invoked:

     • using f(arguments...) notation
     • via a pointer to the function (whether member or non-)
     • via a std::function - (will check the implementation's left unspecified, though I'd expect it to use a pointer to function or pointer to member function under the covers so no new language features)

     Class-specific functions are also invoked in certain situations:

     • constructors are invoked when objects are created on the stack, and when static/global or thread-specific objects or dynamically-allocated objects are dynamically initialised, or with placement new , and as expressions are evaluated
     • destructors are invoked when objects leave scope, are delete d, threads exit, temporaries are destroyed, and when the destructor is explicitly called ala x.~X()
     • all manner of operators ( [] , += , == , < etc.) may be invoked during expression evaluation

     Arbitrary non-member functions may be run by:

     • functions may be run due to earlier std::atexit() or std::at_quick_exit() calls, and if they throw std::terminate may run
     • thread creation and asynchronous signals (again the interfaces accept pointer to functions, and there's no reason to think any implementation has or would use any other technique to achieve dispatch)

     Specific functions are triggered in very specific situations:

     • main() is executed by the runtime
     • std::unexpected , std::unexpected_handler , std::terminate are invoked when dynamic exception specifications are violated

     It's also possible to use setjmp and longjmp to "jump" back into a function... not quite the same thing as calling it though.

     Though not truly "C++", it's also possible to arrange function execution using inline assembly language / linked assembler, writing to executable memory.

     Check all answers on Stack Overflow

     4/5

   • C++ Concepts - Can I have a constraint requiring a function be present in a class?

     Top Answer

     Answered Jul 22, 2024 · 20 votes

     You are testing for the presence of a static member function, but func1 is not static. What you want is

     template <typename T>concept bool HasFunc1 = requires(T t) { { t.func1() } -> int; };

     Check all answers on Stack Overflow

     5/5

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2. www.freecodecamp.org · news · how-to-define-aDef in C – How to Define a Function in C - freeCodeCamp.org

   www.freecodecamp.org · news · how-to-define-a

   

   Apr 12, 2024 · In this article, you learned the very basics of defining functions in C. Specifically, you learned about the two different types of functions in C, and the general syntax for defining your own functions. Lastly, you saw an example of a simple function that added two numbers and returned the result.

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4. www.geeksforgeeks.org · c-functionsC Functions - GeeksforGeeks

   www.geeksforgeeks.org · c-functions

   

   • Syntax of Functions in C
   • Function Declarations
   • Function Definition
   • Function Call
   • Example of C Function
   • Conditions of Return Types and Arguments
   • How Does C Function Work?
   • Passing Parameters to Functions
   • Advantages of Functions in C
   • Disadvantages of Functions in C

   The syntax of function can be divided into 3 aspects: 1. Function Declaration 2. Function Definition 3. Function Calls

   See full list on geeksforgeeks.org

   In a function declaration, we must provide the function name, its return type, and the number and type of its parameters. A function declaration tells the compiler that there is a function with the given name defined somewhere else in the program.

   See full list on geeksforgeeks.org

   The function definition consists of actual statements which are executed when the function is called (i.e. when the program control comes to the function). A C function is generally defined and declared in a single step because the function definition always starts with the function declaration so we do not need to declare it explicitly. The below ...

   See full list on geeksforgeeks.org

   A function call is a statement that instructs the compiler to execute the function. We use the function name and parameters in the function call. In the below example, the first sum function is called and 10,30 are passed to the sum function. After the function call sum of a and b is returned and control is also returned back to the main function o...

   See full list on geeksforgeeks.org

   As we noticed, we have not used explicit function declaration. We simply defined and called the function.

   See full list on geeksforgeeks.org

   In C programming language, functionscan be called either with or without arguments and might return values. They may or might not return values to the calling functions. 1. Function with no arguments and no return value 2. Function with no arguments and with return value 3. Function with argument and with no return value 4. Function with arguments ...

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   Working of the C function can be broken into the following steps as mentioned below: 1. Declaring a function:Declaring a function is a step where we declare a function. Here we define the return types and parameters of the function. 2. Defining a function: 3. Calling the function:Calling the function is a step where we call the function by passing ...

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   The data passed when the function is being invoked is known as the Actual parameters. In the below program, 10 and 30 are known as actual parameters. Formal Parameters are the variable and the data type as mentioned in the function declaration. In the below program, a and b are known as formal parameters. We can pass arguments to the C function in ...

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   Functions in C is a highly useful feature of C with many advantages as mentioned below: 1. The function can reduce the repetition of the same statements in the program. 2. The function makes code readable by providing modularity to our program. 3. There is no fixed number of calling functions it can be called as many times as you want. 4. The funct...

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   The following are the major disadvantages of functions in C: 1. Cannot return multiple values. 2. Memory and time overhead due to stack frame allocation and transfer of program control.

   See full list on geeksforgeeks.org

   • Video Duration: 3 min

5. www.freecodecamp.org · news · how-to-use-functions-in-cHow to Use Functions in C - Explained With Examples

   www.freecodecamp.org · news · how-to-use-functions-in-c

   

   Apr 6, 2023 · In C, a function can be defined anywhere in the program, as long as it is defined before it is used. But it is a good practice to define functions at the beginning of the file or in a separate file to make the code more readable and organized.

6. www.w3schools.com · c · c_functions_declC Function Declaration and Definition - W3Schools

   www.w3schools.com · c · c_functions_decl

   

   A function consist of two parts: Declaration: the function's name, return type, and parameters (if any) Definition: the body of the function (code to be executed)

   Code sample

   void myFunction() {

     printf("I just got executed!");

   }

   int main() {

     myFunction();...

   See more on w3schools

7. www.programiz.com · c-programming · c-functionsC Functions - Programiz

   www.programiz.com · c-programming · c-functions

   

   A function is a block of code that performs a specific task. In this tutorial, you will be introduced to functions (both user-defined and standard library functions) in C programming. Also, you will learn why functions are used in programming.

8. www.w3schools.com · c · c_functionsC Functions - W3Schools

   www.w3schools.com · c · c_functions

   

   A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times.

9. People also ask

   Where can a function be defined in C?

   • In C, a function can be defined anywhere in the program, as long as it is defined before it is used. But it is a good practice to define functions at the beginning of the file or in a separate file to make the code more readable and organized. Here's an example code showing how to define a function in C:

   How to Use Functions in C - Explained With Examples - freeCodeCamp.…

   www.freecodecamp.org/news/how-to-use-functions-in-c/

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   What is a function_name in C?

   • It can be any valid C data type such as int, float, char, or void if the function doesn’t return a value. The function_name is the name you give the function. It should be meaningful and accurately describe what the function does. You will later use this to call the function. The parameter is optional.

   Def in C – How to Define a Function in C - freeCodeCamp.org

   www.freecodecamp.org/news/how-to-define-a-function-in-c

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   Why are functions important in C?

   • Functions are important because they organize your code and promote code reusability. Instead of writing the same code again and again and repeating yourself, you write code once and then can use it whenever you want to perform that specific task. In C, there are generally two types of functions: Standard library functions.

   Def in C – How to Define a Function in C - freeCodeCamp.org

   www.freecodecamp.org/news/how-to-define-a-function-in-c

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   What is a function in C programming?

   • A function is a block of code that performs a specific task. Suppose, you need to create a program to create a circle and color it. You can create two functions to solve this problem: Dividing a complex problem into smaller chunks makes our program easy to understand and reuse. There are two types of function in C programming:

   C Functions - Programiz

   www.programiz.com/c-programming/c-functions

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10. www.henryharvin.com · blog · functions-in-c-programmingA Detailed Guide on Functions in C Programming

    www.henryharvin.com · blog · functions-in-c-programming

    

    Aug 4, 2023 · A function is a collection of instructions denoted by a set of curly brackets () that accept inputs, perform calculations, and output the results. C programming supports modularity and reuse by enabling many calls to the same function.