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8.3 Accessing slots ¶

Preprocessor Macros: mbfl_slot_spec (ARRAYNAME, KEY) ¶

Expand as follows:

mbfl_slot_spec(ARRAYNAME, KEY) → ARRAYNAME[KEY]

This is useful both to build other macros and in situations like the argument to the option -v of printf:

declare -A ARRY
printf -v mbfl_slot_spec(ARRY, KEY) 'A%sC' 'B'

Preprocessor Macros: mbfl_slot_ref (ARRAYNAME, KEY) ¶

Preprocessor Macros: mbfl_slot_qref (ARRAYNAME, KEY) ¶

Expand as follows:

mbfl_slot_ref(ARRAYNAME,  KEY) →  ${ARRAYNAME[KEY]}
mbfl_slot_qref(ARRAYNAME, KEY) → "${ARRAYNAME[KEY]}"

which evaluate to the value of the slot KEY in the array variable ARRAYNAME. These macros works with both indexed and associative arrays.

Preprocessor Macros: mbfl_slot_set (ARRAYNAME, KEY, EXPR) ¶

Expands into the expression:

ARRAYNAME[KEY]=EXPR

which stores the value of EXPR in the slot KEY of the array variable ARRAYNAME. This macro works with both indexed and associative arrays.

Preprocessor Macros: mbfl_slot_append (ARRAYNAME, KEY, EXPR) ¶

Expands into the expression:

ARRAYNAME[KEY]+=EXPR

which appends the value of EXPR in the slot KEY of the array variable ARRAYNAME. This macro works with both indexed and associative arrays.

Example:

mbfl_declare_assoc_array(PAIRS)
mbfl_slot_set(PAIRS, 'abc', '123')
mbfl_slot_append(PAIRS, 'abc', ' 456')
mbfl_slot_qref(PAIRS, 'abc')   ⇒ 123\ 456

Preprocessor Macro: mbfl_slot_value_len (ARRAYNAME, KEY) ¶

Expand into the expression:

${#ARRAYNAME[KEY]}

which is meant to evaluate to the number of characters in the value of the slot KEY.