本文整理汇总了C++中TLeaf::SetOffset方法的典型用法代码示例。如果您正苦于以下问题：C++ TLeaf::SetOffset方法的具体用法？C++ TLeaf::SetOffset怎么用？C++ TLeaf::SetOffset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TLeaf的用法示例。
在下文中一共展示了TLeaf::SetOffset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: fixLeafOffsets
void Output::fixLeafOffsets( TBranch * b)
{
// recalculates the addresses for all the leaves.
//
// when constructing a branch with containing a variable length array with the index
// variable in the same branch it is not possible to specify the span of the index variable
// This span defaults to zero. When the addresses are asigned to the various leaves in the branch
// it calculates the size of the particular leaf (variable length array) in the buffer by looking
// at the span of the index variable - 0 in this case! using the method TLeaf::GetLen().
// The following code shoudl be applied to the branch after the spans of the index variables have been
// specified manually using the TLeaf::SetMaximum method. This time the GetLen method calculates the correct offset.
TObjArray * leaves = b->GetListOfLeaves();
char * addr = b->GetAddress();
int offset = 0;
int nleaves = leaves->GetEntriesFast();
// loop over the leaves:
for( int i =0; i < nleaves; ++i) {
TLeaf * leaf = (TLeaf *)leaves->UncheckedAt(i);
leaf->SetAddress( addr + offset );
int oldOffset = leaf->GetOffset();
leaf->SetOffset( offset );
//std::cout << " offset changed from : " << oldOffset << " to " << offset << std::endl;
TLeaf * index = leaf->GetLeafCount();
int nelements = 1;
if( index ) {
nelements = index->GetMaximum(); // deal with variable length arrays
} else {
nelements = leaf->GetLenStatic(); // deal with single variables and fixed length arrays
}
offset += leaf->GetLenType() * nelements;
}
}