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new_ [1] took a const reference for each of its parameters. Unfortunately, that adds const-ness even when the constructor needs non-constness. Unfortunately, the other way (turning off constness) can lead to excess copying. According to the Forwarding Problem [2], there is no great solution here. C++ does not have a perfect way to write a function which wraps another function. So we settle for non-constness, and we must rely on forbidding copying of expensive objects. [1] as in cx->new_<T>(p1) [2] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1385.htm |
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