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What is the difference between const and readonly in C#?
...Const_V_Readonly
{
public const int I_CONST_VALUE = 2;
public readonly char[] I_RO_VALUE = new Char[]{'a', 'b', 'c'};
public UpdateReadonly()
{
I_RO_VALUE[0] = 'V'; //perfectly legal and will update the value
I_RO_VALUE = new char[]{'V'}; //will cause compiler error
}
}
...
How can I remove a substring from a given String?
...ng, for the first max values of the search String.
static String replaceChars(String str, char searchChar, char replaceChar) Replaces all occurrences of a character in a String with
another.
static String replaceChars(String str, String searchChars, String replaceChars) Replaces multiple cha...
What is a segmentation fault?
...hen you try to write to a portion of memory that was marked as read-only:
char *str = "Foo"; // Compiler marks the constant string as read-only
*str = 'b'; // Which means this is illegal and results in a segfault
Dangling pointer points to a thing that does not exist any more, like here:
char *p...
Android: install .apk programmatically [duplicate]
...my sdcard in download file.
// So please Check in DDMS tab and Select your Emulator.
//Toast.makeText(getApplicationContext(), "Download Complete on SD Card.!", Toast.LENGTH_SHORT).show();
//download the APK to sdcard then fire the Intent.
}
catc...
How to throw an exception in C?
...);
}catch(int64_t x){
printf("good %ld",x);
}
}
int main(int argc, char *argv[])
{
foo();
return 0;
}
to compile it
gcc -o bar.o -c bar.c && g++ a.cc bar.o && ./a.out
output
good 1976
http://mentorembedded.github.io/cxx-abi/abi-eh.html has more detail info about _...
Regular expression to allow spaces between words
...
tl;dr
Just add a space in your character class.
^[a-zA-Z0-9_ ]*$
Now, if you want to be strict...
The above isn't exactly correct. Due to the fact that * means zero or more, it would match all of the following cases that one would not usually mea...
SQLAlchemy: print the actual query
...s:
print(str(statement))
This applies both to an ORM Query as well as any select() or other statement.
Note: the following detailed answer is being maintained on the sqlalchemy documentation.
To get the statement as compiled to a specific dialect or engine, if the statement itself is not already bo...
How do pointer to pointers work in C?
...his case, if this is the only occurrence of "hello" in memory then,
const char *c = "hello";
... defines c to be a pointer to the (read-only) string "hello", and thus contains the value 63. c must itself be stored somewhere: in the example above at location 58. Of course we can not only point to ...
Specify multiple attribute selectors in CSS
...
For concatenating it's:
input[name="Sex"][value="M"] {}
And for taking union it's:
input[name="Sex"], input[value="M"] {}
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What should I do if two libraries provide a function with the same name generating a conflict?
...able in proper context, for example,
int (*alternative_server_init)(int, char **, char **);
Like Ferruccio stated in https://stackoverflow.com/a/678453/1635364 ,
load explicitly the library you want to use by executing (pick your favourite flags)
void* dlhandle;
void* sym;
dlhandle = dlopen("/...