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Can a shell script set environment variables of the calling shell? [duplicate]
..., when run, will set some environment variables that will stay set in the caller's shell.
21 Answers
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How do I execute a command and get the output of the command within C++ using POSIX?
...use the C stdio API, I prefer the iostreams API. popen requires you to manually clean up the FILE handle, pstreams do that automatically. popen only accepts a const char* for the argument, which requires care to avoid shell injection attacks, pstreams allows you to pass a vector of strings similar t...
Running Windows batch file commands asynchronously
... command line return immediately anyway, so to be sure, if you want to run all asynchronously, use START.
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How do I pass a variable by reference?
...will reassign the name to a new object whether it is immutable or not? def Foo(alist): alist = [1,2,3] will not modify the contents of the list from the callers perspective.
– Mark Ransom
Nov 15 '11 at 16:46
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Static constant string (class member)
...files
const string A::RECTANGLE = "rectangle";
The syntax you were originally trying to use (initializer inside class definition) is only allowed with integral and enum types.
Starting from C++17 you have another option, which is quite similar to your original declaration: inline variables
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CS0120: An object reference is required for the nonstatic field, method, or property 'foo'
Consider:
7 Answers
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Check if full path given
...It also returns true for absolute paths.
System.IO.Path.IsPathRooted(@"c:\foo"); // true
System.IO.Path.IsPathRooted(@"\foo"); // true
System.IO.Path.IsPathRooted("foo"); // false
System.IO.Path.IsPathRooted(@"c:1\foo"); // surprisingly also true
System.IO.Path.GetFullPath(@"c:1\foo");// returns "...
Is there a “not in” operator in JavaScript for checking object properties?
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Two quick possibilities:
if(!('foo' in myObj)) { ... }
or
if(myObj['foo'] === undefined) { ... }
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Java Enum definition
...? By making the type argument the new type itself. So if I've got an enum called StatusCode, it would be equivalent to:
public class StatusCode extends Enum<StatusCode>
Now if you check the constraints, we've got Enum<StatusCode> - so E=StatusCode. Let's check: does E extend Enum<S...
Yank file name / path of current buffer in Vim
... has("mac") || has("gui_macvim") || has("gui_mac")
" relative path (src/foo.txt)
nnoremap <leader>cf :let @*=expand("%")<CR>
" absolute path (/something/src/foo.txt)
nnoremap <leader>cF :let @*=expand("%:p")<CR>
" filename (foo.txt)
nnoremap <leader&g...