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Why should the “PIMPL” idiom be used? [duplicate]
... refer to this as the Handle Body idiom. See James Coplien's book Advanced C++ Programming Styles and Idioms (Amazon link). It's also known as the Cheshire Cat because of Lewis Caroll's character that fades away until only the grin remains.
The example code should be distributed across two sets of ...
Which is faster : if (bool) or if(int)?
...
@Nathan: No. C++ has no bit data types. The smallest type is char, which is a byte by definition, and is the smallest addressable unit. bool's size is implementation-defined, and may be 1, 4, or 8, or whatever. Compilers tend to make it o...
What's the point of const pointers?
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const is a tool which you should use in pursuit of a very important C++ concept:
Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.
Even though it doesn't change the functionality, adding const generates a compiler error when you're doing ...
Recommended SQL database design for tags or tagging [closed]
...e, searching for book returns books? Also, what do you do about tags like "c++"? SQL Server, for example, would strip the plus signs in the index. Thanks.
– Jonathan Wood
Jan 18 '11 at 1:41
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What is a segmentation fault?
What is a segmentation fault? Is it different in C and C++? How are segmentation faults and dangling pointers related?
14 A...
How to convert boost path type to string?
...2017)
Documentation: boost::filesystem::canonical.
But note that as of C++17 there is std::filesystem, with canonical and a lot more.
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Is errno thread-safe?
...*___errno();
#define errno (*(___errno()))
#else
extern int errno;
/* ANSI C++ requires that errno be a macro */
#if __cplusplus >= 199711L
#define errno errno
#endif
#endif /* defined(_REENTRANT) */
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Mixin vs inheritance
...roduces the subject.
The Half-Life 2 / "Source" SDK is a great example of C++ mixins. In that environment macros define sizable blocks of code which can be added to give the class a specific "flavor" or feature.
Look at the Source wiki example: Authoring a Logical Entity. In the example code the D...
Why is a boolean 1 byte and not 1 bit of size?
In C++,
12 Answers
12
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How are multi-dimensional arrays formatted in memory?
...as a separate parameter, otherwise use std::array or std::vector (which is C++ not old C). I think we agree @CarlNorum both conceptually for new users and practically, to quote Anders Kaseorg on Quora: “The first step to learning C is understanding that pointers and arrays are the same thing. The ...