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Check if value exists in Postgres array
...d that part of manual. This works great. It has a side effect of automatic casting. Ex: SELECT 1::smallint = ANY ('{1,2,3}'::int[]) works. Just make sure to put ANY() on the right side of expression.
– Mike Starov
Jun 27 '12 at 23:52
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What are all the common undefined behaviours that a C++ programmer should know about? [closed]
...ts in the number (e.g. int64_t i = 1; i <<= 72 is undefined)
Types, Cast and Const
Casting a numeric value into a value that can't be represented by the target type (either directly or via static_cast)
Using an automatic variable before it has been definitely assigned (e.g., int i; i++; cout...
how to convert from int to char*?
...ne, except use const as:
char const* pchar = temp_str.c_str(); //dont use cast
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Static variables in JavaScript
...design template for classes.
It also answers your question:
function Podcast() {
// private variables
var _somePrivateVariable = 123;
// object properties (read/write)
this.title = 'Astronomy Cast';
this.description = 'A fact-based journey through the galaxy.';
this.link...
Get number of digits with JavaScript
...mbers won't be easy due to well known behaviour of floating point math, so cast-to-string approach will be more easy and fool proof. As mentioned by @streetlogics fast casting can be done with simple number to string concatenation, leading the replace solution to be transformed to:
var length = (nu...
How to convert object array to string array in Java
... Good point. I understood the toString as just being a way of casting to a String, not the intention of actually replacing the objects with something else. If that is what you need to do, then looping is the only way.
– Yishai
Jun 19 '09 at 16:14
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Can I use if (pointer) instead of if (pointer != NULL)?
...s, so readability or conciseness isn't that much of an issue here.
Dynamic casts. Casting a base-class pointer to a particular derived-class one (something you should again try to avoid, but may at times find necessary) always succeeds, but results in a null pointer if the derived class doesn't matc...
Nginx缓存解决方案：SRCache - 更多技术 - 清泛网 - 专注C/C++及内核技术
... ngx.exit(ngx.HTTP_SERVICE_UNAVAILABLE)
end
if res == nil and flags == nil and err == nil then
ngx.exit(ngx.HTTP_NOT_FOUND)
end
ngx.print(res)
elseif method == "PUT" then
local value = ngx.req.get_body_data()
local expire = ngx.var.arg_expire or 86400...
Why is there no Constant feature in Java?
...onst int x = 42;
std::cout << x << std::endl;
*const_cast<int*>(&x) = 7;
std::cout << x << std::endl;
return 0;
}
outputs 42 then 7.
Although x marked as const, as a non-const alias is created, x is not a constant. Not every compiler requires ...
Go naming conventions for const
...
The standard library uses camel-case, so I advise you do that as well. The first letter is uppercase or lowercase depending on whether you want to export the constant.
A few examples:
md5.BlockSize
os.O_RDONLY is an exception be...