Tutorial by Examples: absence

In XML, element and attribute names live in namespaces. By default, they are in no namespace: <?xml version="1.0"?> <foo attr="value"> <!-- the foo element is in no namespace, neither is the attr attribute --> </foo>
Before C++17, having pointers with a value of nullptr commonly represented the absence of a value. This is a good solution for large objects that have been dynamically allocated and are already managed by pointers. However, this solution does not work well for small or primitive types such as int, w...

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