66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
#pragma once
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/// \file value.h
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/// \author Folling <folling@ikarus.world>
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#include <ikarus/macros.h>
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/// \defgroup values Values
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/// \brief The values stored in entities.
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/// \details Each entity has a value for each property it is associated with.
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/// The value is of the type specified by the property and constrained by the property's settings.
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/// A value may be indeterminate which means it is unknown or not specified.
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/// \see PropertyType PropertySettings
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/// @{
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IKARUS_BEGIN_HEADER
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/// \brief The common type for all values.
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struct IkarusValue;
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/// \brief Checks if a value is indeterminate.
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/// \param value The value.
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/// \pre \li Must not be null.
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/// \return True if the value is indeterminate, false otherwise.
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IKA_API bool ikarus_value_is_indeterminate(IkarusValue const * value);
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/// \brief Sets the indeterminate state of a value.
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/// \param value The value.
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/// \pre \li Must not be null.
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/// \param indeterminate The new indeterminate state.
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IKA_API void ikarus_value_set_indeterminate(IkarusValue * value, bool indeterminate);
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/// \brief Converts an entity value to a string.
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/// \pre \li Must not be null.
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/// \param value The entity value.
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/// \return A string representation of the value or null if an error occurred.
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/// \remark The returned value is owned by the caller.
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IKA_API char const * ikarus_value_to_string(IkarusValue const * value);
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/// \brief Visits an entity value, calling the appropriate function for the value's type.
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/// \param value The entity value to visit.
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/// \pre \li Must not be null.
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/// \param toggle_visitor The function to call if the value is a toggle value. Skipped if null.
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/// \param number_visitor The function to call if the value is a number value. Skipped if null.
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/// \param text_visitor The function to call if the value is a text value. Skipped if null.
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/// \param data The data passed to the visitor functions.
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IKA_API void ikarus_value_visit(
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IkarusValue * value,
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void (*toggle_visitor)(struct IkarusToggleValue *, void *),
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void (*number_visitor)(struct IkarusNumberValue *, void *),
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void (*text_visitor)(struct IkarusTextValue *, void *),
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void * data
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);
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/// \see ikarus_value_visit
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IKA_API void ikarus_value_visit_const(
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IkarusValue const * value,
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void (*toggle_visitor)(struct IkarusToggleValue const *, void *),
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void (*number_visitor)(struct IkarusNumberValue const *, void *),
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void (*text_visitor)(struct IkarusTextValue const *, void *),
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void * data
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);
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IKARUS_END_HEADER
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/// @}
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