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  2. Command-line argument parsing - Wikipedia

    en.wikipedia.org/wiki/Command-line_argument_parsing

    PHP uses argc as a count of arguments and argv as an array containing the values of the arguments. [ 4 ] [ 5 ] To create an array from command-line arguments in the -foo:bar format, the following might be used:

  3. Variadic macro in the C preprocessor - Wikipedia

    en.wikipedia.org/wiki/Variadic_macro_in_the_C...

    The __VA_OPT__ macro is replaced by its argument when arguments are present, and omitted otherwise. Common compilers also permit passing zero arguments before this addition, however. [4] [6] The C preprocessor rules prevent macro names in the argument of __VA_OPT__ from expanding recursively. It is possible to work around this limitation up to ...

  4. Named parameter - Wikipedia

    en.wikipedia.org/wiki/Named_parameter

    With named parameters, it is usually possible to provide the arguments in any order, since the parameter name attached to each argument identifies its purpose. This reduces the connascence between parts of the program. A few languages support named parameters but still require the arguments to be provided in a specific order.

  5. Variadic function - Wikipedia

    en.wikipedia.org/wiki/Variadic_function

    In functional programming languages, variadics can be considered complementary to the apply function, which takes a function and a list/sequence/array as arguments, and calls the function with the arguments supplied in that list, thus passing a variable number of arguments to the function.

  6. Function pointer - Wikipedia

    en.wikipedia.org/wiki/Function_pointer

    A function pointer, also called a subroutine pointer or procedure pointer, is a pointer referencing executable code, rather than data. Dereferencing the function pointer yields the referenced function, which can be invoked and passed arguments just as in a normal function call.

  7. stdarg.h - Wikipedia

    en.wikipedia.org/wiki/Stdarg.h

    stdarg.h is a header in the C standard library of the C programming language that allows functions to accept an indefinite number of arguments. [1] It provides facilities for stepping through a list of function arguments of unknown number and type.

  8. Calling convention - Wikipedia

    en.wikipedia.org/wiki/Calling_convention

    The calling code does nothing but list the subroutines to be called. This puts all the function setup and clean-up code in one place—the prologue and epilogue of the function—rather than in the many places that function is called. This makes threaded code the most compact calling convention. Threaded code passes all arguments on the stack.

  9. Function (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Function_(computer...

    A copy of the argument is passed in and the value computed during the call is copied to the argument on return: Algol, Swift in-out parameters by name: Like a macro – replace the parameters with the unevaluated argument expressions, then evaluate the argument in the context of the caller every time that the callable uses the parameter: Algol ...