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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 · 41 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.

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

   www.geeksforgeeks.org › c-functions

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   Sep 5, 2023 · 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 example serves as both a function definition and a declaration.

3. 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:

4. 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 are functions in C programming?

   • In this article, you have learned everything about functions in C programming. Functions are the basic building blocks of a C program. They provide the functionalities of reusability, modularity, and simplicity. Hence, it is essential to learn how to create and use functions to optimize your program.

   What Are Functions in C Programming and Types | Simplilearn

   www.simplilearn.com/tutorials/c-tutorial/function-in-c-programming

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   How many types of functions are there in C programming?

   • There are two categories of functions in C Programming: Library functions, often known as predefined functions, are predefined in the C libraries. This means that to call them, we do not need to write a definition or the function’s body. Since they are already defined, we can just call them instead of defining them.

   A Detailed Guide on Functions in C Programming

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

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   What is a function body in C?

   • A function body and a function header make up a function in C. The function header declares the function’s name, return type, and any parameters it takes. The function body contains the actual code. When the function is called, the code gets executed. Group of statements – Code to be executed

   A Detailed Guide on Functions in C Programming

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

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5. stackoverflow.com › questions › 4096304c - Define a function before main? - Stack Overflow

   stackoverflow.com › questions › 4096304

   • Cached

   It is always a good practice to declare the functions in either before main or in a separate header file which will be included in other c files where we have used that function. By doing this we can easily identify all the functions declared/defined in that .C or .H files.

   Code sample

   static int foo(int foo);

   int main(void) {

   foo(1);

   return 0;

   }...

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6. www.cprogrammingnotes.com › tutorial › functionFunction in C - C Programming Notes

   www.cprogrammingnotes.com › tutorial › function

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   A function in C is a block of statements that has a name and can be executed by calling it from some other place in your program. functions are used to divide complicated programs into manageable pieces.

7. www.simplilearn.com › function-in-c-programmingWhat Are Functions in C Programming and Types | Simplilearn

   www.simplilearn.com › function-in-c-programming

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   Aug 3, 2023 · A function is a set of statements enclosed within curly brackets ( {}) that take inputs, do the computation, and provide the resultant output. You can call a function multiple times, thereby allowing reusability and modularity in C programming.

8. 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 · 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.

9. www.cprogramming.com › tutorial › cFunctions in C - Cprogramming.com

   www.cprogramming.com › tutorial › c

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   In general, functions are blocks of code that perform a number of pre-defined commands to accomplish something productive. You can either use the built-in library functions or you can create your own functions. Functions that a programmer writes will generally require a prototype.