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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. en.wikipedia.org › wiki › C_(programming_language)C (programming language) - Wikipedia

   en.wikipedia.org › wiki › C_(programming_language)

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   1 day ago · C ( pronounced / ˈsiː / – like the letter c) [6] is a general-purpose programming language. It was created in the 1970s by Dennis Ritchie and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems, device drivers, and protocol ...

3. en.wikipedia.org › wiki › Function_(mathematics)Function (mathematics) - Wikipedia

   en.wikipedia.org › wiki › Function_(mathematics)

   • Cached

   2 days ago · t. e. In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. [1] The set X is called the domain of the function [2] and the set Y is called the codomain of the function. [3] Functions were originally the idealization of how a varying quantity depends on another quantity.

4. People also ask

   What is a main function in C?

   • The main function serves a special purpose in C programs; the run-time environment calls the main function to begin program execution. The type specifier int indicates that the value that is returned to the invoker (in this case the run-time environment) as a result of evaluating the main function, is an integer.

   C (programming language) - Wikipedia

   en.wikipedia.org/wiki/C_(programming_language)

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   What is a function in programming?

   • That is, it is a program unit that produces an output for each input. However, in many programming languages every subroutine is called a function, even when there is no output, and when the functionality consists simply of modifying some data in the computer memory .

   Function (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Function_(mathematics)

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   What is a function definition?

   • Function definitions, in turn, contain declarations and statements. Declarations either define new types using keywords such as struct, union, and enum, or assign types to and perhaps reserve storage for new variables, usually by writing the type followed by the variable name. Keywords such as char and int specify built-in types.

   C (programming language) - Wikipedia

   en.wikipedia.org/wiki/C_(programming_language)

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   What is the difference between a C source file and a function?

   • C source files contain declarations and function definitions. Function definitions, in turn, contain declarations and statements. Declarations either define new types using keywords such as struct, union, and enum, or assign types to and perhaps reserve storage for new variables, usually by writing the type followed by the variable name.

   C (programming language) - Wikipedia

   en.wikipedia.org/wiki/C_(programming_language)

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5. www.geeksforgeeks.org › function-overloading-inFunction Overloading in Programming - GeeksforGeeks

   www.geeksforgeeks.org › function-overloading-in

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   4 days ago · Function Overloading is a feature of object-oriented programming where two or more functions can have the same name but different parameters. This allows one function to perform different tasks depending on the context of the call. The functions must differ either by the numbers or types of their parameters. It’s a form of static polymorphism ...

6. www.coursehero.com › file › 234678388Understanding Function Definition, Parameters, and Scope in ...

   www.coursehero.com › file › 234678388

   2 days ago · Revision: Function definition • A function definition consists of a name and a body (a block) • The extent of the block is defined by indentation, which must be the same for all statements of a block • Standard indentation is 4 spaces • This example has parameters • Parameters are specified in the function call, and are passed to the code block • A custom function must be defined ...

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8. digitalcollegelibrary.com › function-in-c-questionFunction in C Question-Answers - Digital College Library

   digitalcollegelibrary.com › function-in-c-question

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   2 days ago · The general form of function is given below: – <type> name (arguments) { ---- } Ques 2 : How do you declare and define a Function? All Function in C Must be declared before they are used in the program. C allows the declaration of functions in the calling program with the help of function prototype. The general form of prototype and ...

9. www.scholarhat.com › tutorial › cIdentifiers in C: Types of Identifiers - ScholarHat

   www.scholarhat.com › tutorial › c

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   4 days ago · E.g., "myVar" and "myvar" are two different identifiers. The length of an identifier can be up to 31 characters. However, only the first 31 characters are significant. Identifiers longer than 31 characters will be truncated. They cannot be the same as any reserved words in the C language. Examples of reserved words in C include "if", "while ...

10. stackoverflow.com › questions › 78536355c - Defining a variable inside an if condition and program ...

    stackoverflow.com › questions › 78536355

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    5 days ago · In functions in C, I understand that the stack is normally used to store paramaters passed to a function, and for the local variables for the function. I know that this is compiler and platform-dependent as registers can also be used, but let's say that the stack is just used in this case.