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Determine if map contains a value for a key?
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Obviously you can write your own getValue() routine if you want (also in C++, there is no reason to use out), but I would suspect that once you get the hang of using std::map::find() you won't want to waste your time.
Also your code is slightly wrong:
m.find('2'); will search the map for a keyva...
Python - Create a list with initial capacity
...3587.204933ms
doAllocate: 2701.154947ms
doGenerator: 1721.098185ms
While C++ gives (built with MSVC, 64-bit, Optimizations enabled)
Elements: 100000, Iterations: 144
doAppend: 74.0042ms
doReserve: 27.0015ms
doAllocate: 5.0003ms
C++ debug build produces:
Elements: 100000, Iterations: 144
doAppe...
Is there a SASS.js? Something like LESS.js?
... hasn't been updated in 2 years, I might interest you in sass.js. It's the C++ library libsass (also used by node-sass) compiled to JavaScript using Emscripten. An implementation to compile scss stylesheets linked or inlined in html can be found at sass.link.js.
Try out sass.js using the interactiv...
Is there a difference between copy initialization and direct initialization?
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C++17 Update
In C++17, the meaning of A_factory_func() changed from creating a temporary object (C++<=14) to just specifying the initialization of whatever object this expression is initialized to (loosely speaking) in C+...
Rolling median algorithm in C
...rc/Trunmed.c a few times as I wanted something similar too in a standalone C++ class / C subroutine. Note that this are actually two implementations in one, see src/library/stats/man/runmed.Rd (the source of the help file) which says
\details{
Apart from the end values, the result \code{y = runme...
How to initialize const member variable in a class?
...d into many translation units. However, to avoid complicated linker rules, C++ requires that every object has a unique definition. That rule would be broken if C++ allowed in-class definition of entities that needed to be stored in memory as objects.
A const variable has to be declared within the ...
Why cast unused return values to void?
...o ensure that where necessary error codes are always handled.
I think for C++ this is probably the only place that I prefer to use C-style casts too, since using the full static cast notation just feels like overkill here. Finally, if you're reviewing a coding standard or writing one, then it's al...
Installing SciPy with pip
...te swap file if needed Error message in that case is something like this: c++: internal compiler error: Killed (program cc1plus) error: Command "c++ -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -fPIC -D__STDC_FORMAT_MACROS=1 -I/usr/lib/python2.7/dist-packages/numpy/core/include -I/u...
What is an undefined reference/unresolved external symbol error and how do I fix it?
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Compiling a C++ program takes place in several steps, as specified by 2.2 (credits to Keith Thompson for the reference):
The precedence among the syntax rules of translation is specified by the following phases [see footnote].
Physical...
What is Ruby's double-colon `::`?
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In C#, for instance, yes. On the other hand C++ (and Ruby) use :: for namespace resolution such as std::cout << "Hello World!";
– Jerry Fernholz
Jun 9 '10 at 20:29
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