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Advanced Metaprogramming in Classic C++
book

Advanced Metaprogramming in Classic C++

by Davide Di Gennaro
May 2015
Intermediate to advanced content levelIntermediate to advanced
572 pages
9h 52m
English
Apress
Content preview from Advanced Metaprogramming in Classic C++

CHAPTER 9

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The Opaque Type Principle

Template type names can be too complex for the user to use directly, as they may be verbose or they may require very complex syntax. So you should either publish a convenient typedef or allow users to ignore their type altogether.

Plain C is full of opaque types.

In C, a file stream is handled via a pointer to an unknown FILE structure that resides in system memory (the C runtime pre-allocates a small number of these structures). To retrieve the current position in an open file, you call fgetpos(FILE*, fpos_t), passing the file pointer and another opaque type that acts as a bookmark. You can’t know or modify ...

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ISBN: 9781484210109Purchase book