大约有 830 项符合查询结果（耗时：0.0197秒） [XML]
TCP: can two different sockets share a port?
... you say is entirely true of the server side. However the structure of the BSD Sockets API means that outgoing client-side ports must be unique in practice, because the bind() operation precedes the connect() operation, even implicitly.
– Marquis of Lorne
Jun 2...
Validate decimal numbers in JavaScript - IsNumeric()
...alStringObj - parseFloat(realStringObj) + 1) >= 0;
}
Update :
Angular 4.3:
export function isNumeric(value: any): boolean {
return !isNaN(value - parseFloat(value));
}
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error: ‘NULL’ was not declared in this scope
I get this message when compiling C++ on gcc 4.3
6 Answers
6
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What is “:-!!” in C code?
...lds in GCC 4.4).
In sympathy for the need for compile-time assertions, GCC 4.3 introduced the error function attribute that allows you to extend upon this older concept, but generate a compile-time error with a message of your choosing -- no more cryptic "negative sized array" error messages!
#defin...
Hiding elements in responsive layout?
...ttp://v4-alpha.getbootstrap.com/layout/responsive-utilities/
On Bootstrap 4.3.x: https://getbootstrap.com/docs/4.3/utilities/display/
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src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
... have libxml2 already installed and upgraded to version 2.9.0+dfsg1-4ubuntu4.3 you need to downgrade it to 2.9.0+dfsg1-4ubuntu4.1 by typing the command sudo apt-get install libxml2=2.9.0+dfsg1-4ubuntu4.1 otherwise the libxml2-dev wont be installed due version dependency.
– Ghas...
Using “Object.create” instead of “new”
...s not yet standard on several browsers, for example IE8, Opera v11.5, Konq 4.3 do not have it. You can use Douglas Crockford's version of Object.create for those browsers but this doesn't include the second 'initialisation object' parameter used in CMS's answer.
For cross browser code one way to ge...
GNU Makefile rule generating a few targets from a single source file
...
After GNU Make 4.3 (19th Jan. 2020) you can use “grouped explicit targets”. Replace : with &:.
file-a.out file-b.out &: input.in
foo-bin input.in file-a.out file-b.out
The NEWS file of the GNU Make says:
New feature: Group...
Creating C macro with ## and __LINE__ (token concatenation with positioning macro)
...same line. Note: __COUNTER__ is supported by MS Visual Studio, GCC (since V4.3), and Clang, but is not standard C.
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Weighted random numbers
...sephBudin Then again, you'd never be able to have an irrational weight. A ~4.3 billion case switch should do just fine for float weights. :D
– Jason C
Jul 8 '19 at 1:33
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