C class initialization4/5/2023 ![]() ![]() The drawback is that we've hidden the second pair constructor - it's implicit. It also knows how to create a pair given a string, so it can easily evaluate (p = s). It knows how to compare two pairs because you told it how in the pair class. Now suppose you do the following comparison, either purposefully or accidentally: pair p I compared the speed of the following functions: template void ByValue(T t) As you'll see, even for relatively small objects, the penalty of passing by value can be stiff. This is an easy tip to forget, especially for small objects. Passing an object by value requires that the entire object be copied (copy ctor), whereas passing by reference does not invoke a copy constructor, though you pay a "dereference" penalty when the object is used within the function. ![]() C++ Optimizations You Can Do "As You Go" Back to C++ Optimization Techniquesģ: C++ Optimizations You Can Do "As You Go"ĭefy the software engineering mantra of "optimization procrastination." These techniques can be added to your code today! In general, these methods not only make your code more efficient, but increase readability and maintainability, too. ![]()
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