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check for empty data pointer in Len() and Empty()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@766 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Karsten Ballüder 1998-09-21 20:13:41 +00:00
parent 1c4a764c98
commit ecadfc3f5a
1 changed files with 2 additions and 2 deletions
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4
include/wx/string.h
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@ -254,13 +254,13 @@ public:
/** @name generic attributes & operations */ /** @name generic attributes & operations */
//@{ //@{
/// as standard strlen() /// as standard strlen()
size_t Len() const { return GetStringData()->nDataLength; } size_t Len() const { return GetStringData() ? GetStringData()->nDataLength : 0; }
/// string contains any characters? /// string contains any characters?
bool IsEmpty() const { return Len() == 0; } bool IsEmpty() const { return Len() == 0; }
/// reinitialize string (and free data!) /// reinitialize string (and free data!)
void Empty() void Empty()
{ {
if ( GetStringData()->nDataLength != 0 ) if ( GetStringData() && GetStringData()->nDataLength != 0 )
Reinit(); Reinit();
wxASSERT( GetStringData()->nDataLength == 0 ); wxASSERT( GetStringData()->nDataLength == 0 );