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CentOS 7.0 - man page for tcl_getdoublefromobj (centos section 3)

Tcl_DoubleObj(3)				Tcl Library Procedures				     Tcl_DoubleObj(3)

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NAME
Tcl_NewDoubleObj, Tcl_SetDoubleObj, Tcl_GetDoubleFromObj - manipulate Tcl objects as floating-point values
SYNOPSIS
#include <tcl.h> Tcl_Obj * Tcl_NewDoubleObj(doubleValue) Tcl_SetDoubleObj(objPtr, doubleValue) int Tcl_GetDoubleFromObj(interp, objPtr, doublePtr)
ARGUMENTS
double doubleValue (in) A double-precision floating-point value used to initialize or set a Tcl object. Tcl_Obj *objPtr (in/out) For Tcl_SetDoubleObj, this points to the object in which to store a dou- ble value. For Tcl_GetDoubleFromObj, this refers to the object from which to retrieve a double value. Tcl_Interp *interp (in/out) When non-NULL, an error message is left here when double value retrieval fails. double *doublePtr (out) Points to place to store the double value obtained from objPtr. _________________________________________________________________
DESCRIPTION
These procedures are used to create, modify, and read Tcl objects that hold double-precision floating-point values. Tcl_NewDoubleObj creates and returns a new Tcl object initialized to the double value doubleValue. The returned Tcl object is unshared. Tcl_SetDoubleObj sets the value of an existing Tcl object pointed to by objPtr to the double value double- Value. The objPtr argument must point to an unshared Tcl object. Any attempt to set the value of a shared Tcl object violates Tcl's copy-on-write policy. Any existing string representation or internal representation in the unshared Tcl object will be freed as a consequence of setting the new value. Tcl_GetDoubleFromObj attempts to retrieve a double value from the Tcl object objPtr. If the attempt succeeds, then TCL_OK is returned, and the double value is written to the storage pointed to by doublePtr. If the attempt fails, then TCL_ERROR is returned, and if interp is non-NULL, an error message is left in interp. The Tcl_ObjType of objPtr may be changed to make subsequent calls to Tcl_GetDoubleFromObj more efficient.
SEE ALSO
Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult
KEYWORDS
double, double object, double type, internal representation, object, object type, string representation Tcl 8.0 Tcl_DoubleObj(3)
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