本文整理汇总了C#中FuncDef.Copy方法的典型用法代码示例。如果您正苦于以下问题：C# FuncDef.Copy方法的具体用法？C# FuncDef.Copy怎么用？C# FuncDef.Copy使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类FuncDef的用法示例。
在下文中一共展示了FuncDef.Copy方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: sqlite3VtabOverloadFunction
/*
** The first parameter (pDef) is a function implementation. The
** second parameter (pExpr) is the first argument to this function.
** If pExpr is a column in a virtual table, then let the virtual
** table implementation have an opportunity to overload the function.
**
** This routine is used to allow virtual table implementations to
** overload MATCH, LIKE, GLOB, and REGEXP operators.
**
** Return either the pDef argument (indicating no change) or a
** new FuncDef structure that is marked as ephemeral using the
** SQLITE_FUNC_EPHEM flag.
*/
static FuncDef sqlite3VtabOverloadFunction(
sqlite3 db, /* Database connection for reporting malloc problems */
FuncDef pDef, /* Function to possibly overload */
int nArg, /* Number of arguments to the function */
Expr pExpr /* First argument to the function */
)
{
Table pTab;
sqlite3_vtab pVtab;
sqlite3_module pMod;
dxFunc xFunc = null;//void (*xFunc)(sqlite3_context*,int,sqlite3_value*) = 0;
object pArg = null;
FuncDef pNew;
int rc = 0;
string zLowerName;
string z;
/* Check to see the left operand is a column in a virtual table */
if ( NEVER( pExpr == null ) )
return pDef;
if ( pExpr.op != TK_COLUMN )
return pDef;
pTab = pExpr.pTab;
if ( NEVER( pTab == null ) )
return pDef;
if ( ( pTab.tabFlags & TF_Virtual ) == 0 )
return pDef;
pVtab = sqlite3GetVTable( db, pTab ).pVtab;
Debug.Assert( pVtab != null );
Debug.Assert( pVtab.pModule != null );
pMod = (sqlite3_module)pVtab.pModule;
if ( pMod.xFindFunction == null )
return pDef;
/* Call the xFindFunction method on the virtual table implementation
** to see if the implementation wants to overload this function
*/
zLowerName = pDef.zName;//sqlite3DbStrDup(db, pDef.zName);
if ( zLowerName != null )
{
//for(z=(unsigned char)zLowerName; *z; z++){
// *z = sqlite3UpperToLower[*z];
//}
rc = pMod.xFindFunction( pVtab, nArg, zLowerName.ToLowerInvariant(), ref xFunc, ref pArg );
sqlite3DbFree( db, ref zLowerName );
}
if ( rc == 0 )
{
return pDef;
}
/* Create a new ephemeral function definition for the overloaded
** function */
//sqlite3DbMallocZero(db, sizeof(*pNew)
// + sqlite3Strlen30(pDef.zName) + 1);
//if ( pNew == null )
//{
// return pDef;
//}
pNew = pDef.Copy();
pNew.zName = pDef.zName;
//pNew.zName = (char )&pNew[1];
//memcpy(pNew.zName, pDef.zName, sqlite3Strlen30(pDef.zName)+1);
pNew.xFunc = xFunc;
pNew.pUserData = pArg;
pNew.flags |= SQLITE_FUNC_EPHEM;
return pNew;
}