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'const int' vs. 'int const' as function parameters in C++ and C
... a constant integer. Neither "a" nor "*a" can be assigned to.
static int one = 1;
int testfunc3 (const int *a)
{
*a = 1; /* Error */
a = &one;
return *a;
}
int testfunc4 (int * const a)
{
*a = 1;
a = &one; /* Error */
return *a;
}
int testfunc5 (const int * const a)
{
*a =...
How to use concerns in Rails 4
... models and avoid them getting too fat and messy.
As an example, I'll put one well known pattern, the taggable pattern:
# app/models/product.rb
class Product
include Taggable
...
end
# app/models/concerns/taggable.rb
# notice that the file name has to match the module name
# (applying Rails...
setting multiple column using one update
...lass=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49....
What is the difference between Θ(n) and O(n)?
... Wikipedia: "In mathematics, two variables are proportional if a change in one is always accompanied by a change in the other, and if the changes are always related by use of a constant multiplier. The constant is called the coefficient of proportionality or proportionality constant."
...
JSON Naming Convention (snake_case, camelCase or PascalCase) [closed]
...ava" (camelCase) and "C" (underscores, snake_case)) -- as well as at least one more, kebab-case like longer-name).
It mostly seems to depend on what background developers of the service in question had; those with c/c++ background (or languages that adopt similar naming, which includes many scripti...
How do I change the working directory in Python?
...is thrown, do not perform any recursive operations, especially destructive ones. They will operate on the old path and not the new one.
Return to your old directory when you're done. This can be done in an exception-safe manner by wrapping your chdir call in a context manager, like Brian M. Hunt d...
How do I pass a unique_ptr argument to a constructor or a function?
...: next(std::move(n)) {}
In order for the user to call this, they must do one of the following:
Base newBase(std::move(nextBase));
Base fromTemp(std::unique_ptr<Base>(new Base(...));
To take a unique pointer by value means that you are transferring ownership of the pointer to the function/...
Command copy exited with code 4 when building - Visual Studio restart solves it
...iably found this to be a file locking issue. Code 4 is Cannot Access File. One partial solution I found is to use the /C option for xcopy (which continues on error). Not really a solution but mostly it has stopped my builds from failing.
Another solution which only works on 32 bit is to use the unl...
What is the performance of Objects/Arrays in JavaScript? (specifically for Google V8)
...ted the each write case to be incrementally unique, to prevent JIT... And honestly, unless the JIT optimization is that good (which I find it hard to believe), it could just be a case of poorly optimized read, or heavily optimized writes (write to immediate buffer?)... which is worth investigating :...
How to shorten my conditional statements
...or the result in the first column. All other columns to the left have only one row with a 1, so the 1 carried over from the previous column will again add up to 2, which will then carry over... This process repeats itself till we get to the left-most column, where the 1 to be carried over has nowher...