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honey the codewitch wrote:

Focused using butterflies

Quote:

All C++ programs must have a main function. If you try to compile a C++ .exe project without a main function, the compiler will raise an error. (Dynamic-link libraries and static libraries don't have a main function.) The main function is where your source code begins execution, but before a program enters the main function, all static class members without explicit initializers are set to zero. In Microsoft C++, global static objects are also initialized before entry to main. Several restrictions apply to the main function that do not apply to any other C++ functions. The main function:

* Cannot be overloaded (see Function Overloading).
* Cannot be declared as inline.
* Cannot be declared as static.
* Cannot have its address taken.
* Cannot be called.

raddevus wrote:

* Cannot have its address taken.
* Cannot be called.

 #include <iostream>

int main(int argc, char **argv)
{
    if(argc <= 1) {
        auto main_ptr{main};
        std::cout << "pointer to main = " << main_ptr << std::endl;
        std::cout << "exiting ..." << std::endl;
        return 0;
    }
    std::cout << "argc = " << argc << std::endl;
    main(--argc, argv);
}

Richard MacCutchan wrote:

don't know why you would want to

Callback (computer programming) - Wikipedia[^]

a callback, also known as a "call-after"[1] function, is any executable code that is passed as an argument to other code that is expected to call back (execute) the argument at a given time.