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13.4.6 Data Type Specific Index Front Functions

if_e_<type-name>

<type> if_e_<type-name>(<type> &d, index i);

is the data in the first position in the i index, sets d as the same data (assumed of the <type> data type) and removes it from the index

if_g_<type-name>

<type> if_g_<type-name>(<type> &d, index i);

is the data in the first position in the i index, sets d as the same (data is linked if allowed, copied otherwise, data assumed of the <type> data type)

if_q_<type-name>

<type> if_q_<type-name>(index i);

is the data in the first position in the i index (assumed of the <type> data type)

if_x_<type-name>

<type> if_x_<type-name>(index i);

is the data in the first position in the i index (assumed of the <type> data type), the data is removed from the index