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Flexible array member information


C struct data types may end with a flexible array member[1] with no specified size:

struct vectord {
    short len;    // there must be at least one other data member
    double arr[]; // the flexible array member must be last
    // The compiler may reserve extra padding space here, like it can between struct members
};

Typically, such structures serve as the header in a larger, variable memory allocation:

struct vectord *vector = malloc(...);
vector->len = ...;
for (int i = 0; i < vector->len; i++)
     vector->arr[i] = ...;  // transparently uses the right type (double)
  1. ^ "Lesser known C features". Retrieved December 30, 2014.

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