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HDK
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The template class UT_Pair is no longer used in the HDK and now deprecated along with the UT_IntPair class. The entire UT_Pair.h header will be removed in a future release. Please use std::pair instead.
The OP_Node::getLock() method has now changed to return a bool instead of returning an int of values from the OP_NodeFlags::OP_LockTypes enum. This method now returns true if the lock flag is not equal to OP_NodeFlags::OP_UNLOCKED and false otherwise.
The OP_Node::setLock() method has been removed in favour of new OP_Node::setSoftLock() and OP_Node::setHardLock() methods in order to clarify what happens when setLock() is called.
The old OP_Node::getLock() and OP_Node::setLock() methods have been renamed to OP_Node::getLockState() and OP_Node::setLockState() and also now explicitly specify OP_NodeFlags::OP_LockTypes in their interface instead of the ambiguous int. Similarly, OP_Node::setModelLock() has its function signature improved as well.
Houdini's internal namespaced boost has been updated from version 1.61 to version 1.72. Notable changes include SYShashCombine() which now use a different algorithm. As a result SYShash() and various hash() methods now return different values. For UT_Set, UT_Map, UT_StringSet, UT_StringMap, this results in different iteration order of elements.
CE_Context::releaseBuffer() now requires the provided buffer to be an rvalue reference instead of a const reference, as it transfers ownership back to the memory pool.
GU_PrimPacked stores a reference to the implementation of the packed primitive. In H18.0, the implementation was moved to a "shared" representation. This improves performance of copying and other operations on packed primitives.
The previous method, GU_PrimPacked::implementation() returned an reference to the shared implementation, while GU_PrimPacked::hardenImplementation() would ensure the implementation was unique and could be modified.
The GU_PrimPacked::implementation() method has been deprecated since it wasn't clear that this was returning a reference to the shared object. The new method is GU_PrimPacked::sharedImplementation().
1.8.6 
