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cplusplus:goingnative2013 [2013/09/18 10:14]
dblume
cplusplus:goingnative2013 [2017/10/20 18:03] (current)
dblume
Line 67: Line 67:
 CINDER_APP_BASIC( MyApp, RendererDx ) CINDER_APP_BASIC( MyApp, RendererDx )
 </file> </file>
 +
 +===== Advanced Optimization =====
 +
 +Use lambda in place of std::bind to save memory. A std::bind() on a pointer-to-member-function will allocate 24 bytes on the heap for the bind structure. If instead you use a lambda, then this fits into 4 bytes and avoids any allocation.
 +
 +Replace:
 +
 +    g(this, std::bind(&m_f, this)),
 +
 +With:
 +
 +    g(this, [this](){this->m_f();}),
 +
 +Note that subtle changes to object lifetimes is possible. This code:
 +
 +    std::bind(f, std::weak_ptr<Object>(n));
 +    
 +is not the same as this code:
 +
 +    [n]{ f(std::weak_ptr<Object>(n)); }
 +    
 +The above code will bind the shared_ptr<Node> into the lambda's capture, extending the lifetime.
 +But it is the same as this:
 +
 +    [wp = std::weak_ptr<Object>(n)]{ f(wp); };
 +
 +In this case the lambda's capture only has the weak pointer.
cplusplus/goingnative2013.txt · Last modified: 2017/10/20 18:03 by dblume
 
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