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49 lines
1016 B
Plaintext
49 lines
1016 B
Plaintext
NAME
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saveval - enable or disable saving of values
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SYNOPSIS
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saveval(arg)
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TYPES
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arg any
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return null value
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DESCRIPTION
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When evaluation of a line of statements at top level starts, a
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"saved value" for that line is assigned the null value. When saving
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is enabled (the initial state) and a statement being evaluated is an
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expression or a return statement, the value returned by that expression
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or statement replaces the current saved value; on completion of
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evaluation of the line, the saved value, if it is not null, updates
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the "oldvalue".
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This saving of values is enabled or disabled by calling saveval(arg)
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with an argument arg that tests as nonzero or zero,
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Whether saving is enabled or disabled does not affect the operation of
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eval(str).
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EXAMPLE
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> saveval(1);
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> a = 27;
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.
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27
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> saveval(0);
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> a = 45
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.
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27
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> saveval(1);
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> a = 63
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.
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63
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LIMITS
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none
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LIBRARY
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none
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SEE ALSO
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oldvalue, eval
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