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Is std::unique_ptr required to know the full definition of T?
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Adopted from here.
Most templates in the C++ standard library require that they be instantiated with complete types. However shared_ptr and unique_ptr are partial exceptions. Some, but not all of their members can be instantiated with incomplete types. The motivatio...
What can I do with a moved-from object?
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17.6.5.15 [lib.types.movedfrom]
Objects of types defined in the C++ standard library may be moved from
(12.8). Move operations may be explicitly specified or implicitly
generated. Unless otherwise specified, such moved-from objects shall
be placed in a valid but unspecified state.
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Do c++11 lambdas capture variables they don't use?
...ble is not captured. In your example, my_huge_vector is not captured.
Per C++11 §5.1.2[expr.prim.lambda]/11:
If a lambda-expression has an associated capture-default and its compound-statement odr-uses this or a variable with automatic storage duration and the odr-used entity is not explicitly c...
What happens to a detached thread when main() exits?
...n signal handlers may execute ([basic.start.term]/1, 1st sentence). Of the C++ standard library, that is only the <atomic> library ([support.runtime]/9, 2nd sentence). In particular, that—in general—excludes condition_variable (it's implementation-defined whether that is save to use in a s...
What Every Programmer Should Know About Memory?
...the benchmarks). See also other x86 performance-tuning and SSE/asm (and C/C++) optimization links in the x86 tag wiki. (Ulrich's article isn't x86 specific, but most (all) of his benchmarks are on x86 hardware.)
The low level hardware details about how DRAM and caches work all still apply. DDR4...
Why does C++11's lambda require “mutable” keyword for capture-by-value, by default?
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This is a good point. I totally agree. In C++0x though, I don't quite see how the default helps enforce the above. Consider I am on the receiving end of the lambda, e.g. I am void f(const std::function<int(int)> g). How am I guaranteed that g is actually refere...
Why do you have to link the math library in C?
...or this libm/libc split, none of them very convincing.
Interestingly, the C++ runtime libstdc++ requires libm, so if you compile a C++ program with GCC (g++), you will automatically get libm linked in.
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Can I implement an autonomous `self` member type in C++?
C++ lacks the equivalent of PHP's self keyword , which evaluates to the type of the enclosing class.
13 Answers
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Objective-C categories in static library
... entirely ignored in the linking process.
This works quite well for C and C++ code, as these languages try to do as much as possible at compile time (though C++ also has some runtime-only features). Obj-C, however, is a different kind of language. Obj-C heavily depends on runtime features and many ...
Why does the indexing start with zero in 'C'?
... is. Even if 1-based indexes offered some advantage, it's in the spirit of C++ to choose performance over convenience. C++ is sometimes used in contexts where every last bit of performance matters, and these "small" things can quickly add up.
– Branko Dimitrijevic
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