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Doc: describe empty geometry for getNumGeometries #950

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Aug 28, 2023
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Doc: describe empty geometry for getNumGeometries #950

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2 changes: 2 additions & 0 deletions capi/geos_c.h.in
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Expand Up @@ -2580,6 +2580,8 @@ extern void GEOS_DLL *GEOSGeom_getUserData(const GEOSGeometry* g);
* multi-geometry or collection or 1 for a simple geometry.
* For nested collections, remember to check if returned
* sub-geometries are **themselves** also collections.
* Empty collection or multi-geometry types return 0,
* and empty simple geometry types return 1.
* \param g Input geometry
* \return Number of direct children in this collection
* \warning For GEOS < 3.2 this function may crash when fed simple geometries
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9 changes: 7 additions & 2 deletions include/geos/geom/Geometry.h
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Expand Up @@ -302,8 +302,13 @@ class GEOS_DLL Geometry {
/// Return an integer representation of this Geometry type
virtual GeometryTypeId getGeometryTypeId() const = 0; //Abstract

/// Returns the number of geometries in this collection
/// (or 1 if this is not a collection)
/**
* \brief Returns the number of geometries in this collection,
* or 1 if this is not a collection.
*
* Empty collection or multi-geometry types return 0,
* and empty simple geometry types return 1.
*/
virtual std::size_t
getNumGeometries() const
{
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