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Indirection Operator

from Kubark​.​pdf by Ave Grave

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A basic example of multiple pointer indirection is the argv argument to the main function in C (and C++), which is given in the prototype as char **argv. The name of the invoked program executable, as well as all command line arguments that followed, are stored as independent character strings. An array of pointers to char contains pointers to the first character of each of these strings, and this array of pointers is passed to the main function as the argv argument. The passed array itself "decays" to a pointer, thus argv is actually a pointer to a pointer to char, even though it stands for an array of pointers to char (similarly, the pointers in the array, while each formally pointing to a single char, actually point to what are strings of characters). The accompanying main argument, argc, provides the size of the array (i.e. the number of strings pointed to by the elements of the array), as the size of an (outmost) array is otherwise lost when it is passed to a function and converted to a pointer. Thus, argv is a pointer to the 0th element of an array of pointers to char, *argv, which in turn is a pointer to **argv, a character (precisely, the 0th character of the first argument string, which by convention is the name of the program).

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from Kubark​.​pdf, released February 8, 2019

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Ave Grave Berlin, Germany

Sean Christopher Galloway is a Berlin-based musician. Under his Ave Grave moniker, Galloway creates textural music using field recording techniques and bits of manipulated melodic sound. Combining these layered sounds with soft spoken pieces of traditional songwriting, Ave Grave creates a nuanced, quiet world; a place both wonderful and strange. ... more

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