optional.h File Reference

C analog of C++’s std::optional More...

#include <assert.h>
#include <stdbool.h>
#include <stddef.h>

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Data Structures
struct	optional_double_t
	a container that may or may not contain a double value More...

Functions
static void	optional_double_set (optional_double_t *me, double value)
static double	optional_double_value_or (optional_double_t me, double fallback)

Function Documentation

optional_double_set()

static void optional_double_set ( optional_double_t *  me, double  value  )

inlinestatic

set the value of an optional

This utility function is intended to avoid the easy typo of setting the value while forgetting to set the has_value member.

Parameters

me	The optional whose value to set
value	The value to assign

Definition at line 23 of file optional.h.

References optional_double_t::has_value, NULL, and optional_double_t::value.

Referenced by svg_size().

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optional_double_value_or()

static double optional_double_value_or ( optional_double_t  me, double  fallback  )

inlinestatic

get the value of an optional or a given value if the optional is empty

Parameters

me	The optional whose value to retrieve
fallback	The value to return if the optional is empty

Returns

Value of the optional or fallback if it was empty

Definition at line 34 of file optional.h.

References optional_double_t::has_value, and optional_double_t::value.

Referenced by svg_size().

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