ST_ForceCurve
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## Name

ST_ForceCurve — Upcast a geometry into its curved type, if applicable.

## Synopsis

`geometry ST_ForceCurve(`geometry g`)`;

## Description

Turns a geometry into its curved representation, if applicable: lines become compoundcurves, multilines become multicurves polygons become curvepolygons multipolygons become multisurfaces. If the geometry input is already a curved representation returns back same as input.

Availability: 2.2.0

This function supports 3d and will not drop the z-index.

This method supports Circular Strings and Curves

## Examples

    SELECT ST_AsText(
      ST_ForceCurve(
    	'POLYGON((0 0 2, 5 0 2, 0 5 2, 0 0 2),(1 1 2, 1 3 2, 3 1 2, 1 1 2))'::geometry
      )
    );
                                  st_astext
    ----------------------------------------------------------------------
     CURVEPOLYGON Z ((0 0 2,5 0 2,0 5 2,0 0 2),(1 1 2,1 3 2,3 1 2,1 1 2))
    (1 row)

## See Also

ST_LineToCurve

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