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What are the consequences of the missing standard library functionality?

April 26, 2017consequences functionality library MISSING standard

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What are the consequences of the missing standard library functionality?

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Some code that is valid according to the C++ standard will not compile. The most common example is creating maps where the first element of the pair could be const but isn’t declared that way. The member constructor template would convert pair to pair implicitly when needed. Because that constructor is missing, you get compilation errors instead. Since you are not allowed to change the first member of a pair in a map anyway, the simplest fix is to use an explicit const when creating the pair type. For example, instead of pair use pair; instead of map use map.