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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.

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     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.

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     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) } }}

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     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!

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     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.

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     4/5

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

     Top Answer

     Answered Dec 03, 2021 · 20 votes

     You are testing for presence of a static member function. What you want is

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

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     5/5

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2. 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

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   Apr 6, 2023 · Where Should a Function Be Defined? 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:

3. 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

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   Apr 12, 2024 · Next, I defined the main() function, which is the starting point of every C program: int main ( void ) { int num1, num2, result; printf ( "Enter first number: " ); scanf ( "%d" , &num1); printf ( "Enter second number: " ); scanf ( "%d" , &num2); result = add(num1, num2); printf ( "The sum of %d and %d is %d\n" , num1, num2, result); return 0 ; }

4. People also ask

   How do you define a function in C?

   • In C, functions must be defined before they are used. By placing the add() function definition above the main() function, the compiler knows about it when it encounters the function call in main(). Next, I defined the main() function, which is the starting point of every C program:

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

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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

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   How to call a function in C?

   • Here is the syntax for calling a function in C: Let's break it down: function_name is the name of the function you want to call. It should be the same name you used to define your function. arguments are the values you pass to the function. If the function accepts any parameters, you pass the arguments in parentheses when you call the function.

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

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   What are functions in C programming?

   • Functions are an essential part of programming in C. They allow you to break down your code into smaller, reusable blocks of code, making it easier to understand, debug, and maintain. In this guide, we will take a detailed look at functions in C programming, covering their syntax, types, parameters, return values, and best practices.

   A Detailed Guide on Functions in C Programming

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

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5. www.geeksforgeeks.org › c-functionsC Functions - GeeksforGeeks

   www.geeksforgeeks.org › c-functions

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   • Video Duration: 3 min

   • Syntax of Functions in C. The syntax of function can be divided into 3 aspects: Function Declaration. Function Definition. Function Calls.
   • Function Declarations. 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.
   • Function Definition. 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).
   • Function Call. 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.

6. www.makeuseof.com › c-functions-introductionAn Introduction to C Functions - MUO

   www.makeuseof.com › c-functions-introduction

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   Aug 26, 2023 · return_type is the data type of the value that the function returns. It can be any valid C data type or void if the function doesn't return a value. function_name is the name you give to the function. You'll use this to call the function later. parameters is a list of input parameters the function accepts, if any. Each parameter consists of a ...

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

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

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   Aug 4, 2023 · Here’s the general syntax of a function in C: In the syntax above, Types of Functions in C Programming Language. Library Functions; User-Defined Functions; In C, How do You Call a Function? 1. Functions in C Programming Without Arguments and Return Value. Output; 2. Functions In C Programming With Arguments but Without Return Value. Output; 3.

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8. www.cs.uic.edu › C_Programming › FunctionsC Programming Course Notes - Functions

   www.cs.uic.edu › C_Programming › Functions

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   ( E.g. function A calls function B which calls function C which calls function A. ) A very important issue when writing recursive functions is that there be a defined stopping condition that will stop the recursion and prevent it from calling itself forever in an infinitely recursive loop, and that there be a guarantee that once the function is ...

9. en.cppreference.com › w › cFunction definitions - cppreference.com

   en.cppreference.com › w › c

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   Jun 24, 2021 · C supports two different forms of function definitions: where. 1) New-style (C89) function definition. This definition both introduces the function itself and serves as a function prototype for any future function call expressions, forcing conversions from argument expressions to the declared parameter types.