大约有 41,000 项符合查询结果（耗时：0.0505秒） [XML]
What is the meaning of the term arena in relation to memory?
... manage memory manually by handing out parts of that memory. For example:
char * arena = malloc(HUGE_NUMBER);
unsigned int current = 0;
void * my_malloc(size_t n) { current += n; return arena + current - n; }
The point is that you get full control over how the memory allocation works. The only ...
How to use android emulator for testing bluetooth application?
... virtual machine set the network adapter to 'Bridged'. ·
Start the VM and select 'Live CD VESA' at boot.
Now you need to find out the IP of this VM. Go to terminal in VM (use Alt+F1
& Alt+F7 to toggle) and use the netcfg command to find this.
Now you need open a command prompt and go to your ...
What is more efficient? Using pow to square or just multiply it with itself?
...d::chrono::high_resolution_clock::time_point from;
};
int main (int argc, char* argv[])
{
double total;
Timer timer;
total = 0.0;
timer.start();
for (double i = 0.0; i < 1.0; i += 1e-8)
total += std::pow (i,2);
std::cout << "std::pow(i,2): " << timer.elapsed() <...
What is the most appropriate way to store user settings in Android application
... protected static final String UTF8 = "utf-8";
private static final char[] SEKRIT = ... ; // INSERT A RANDOM PASSWORD HERE.
// Don't use anything you wouldn't want to
// get out there if someone deco...
How to export DataTable to Excel
...tring[] columnNames = dataTable.Columns
.Cast<DataColumn>()
.Select(column => column.ColumnName)
.ToArray();
var header = string.Join(",", columnNames.Select(name => $"\"{name}\""));
lines.Add(header);
var valueLines = dataTable.AsEnumerable()
.Select(row => string.J...
How to copy from current position to the end of line in vi
...opy/paste between different instances, you can use the system clipboard by selecting the * register, so the commands become "*y$ for copying and "*p for pasting.
$ move-to-linebreak
$
y$ yank-to-linebreak
y,$
"*y$ select clipboard-register yank-to-linebreak
",*,y,$
"*p select clipboard-regist...
Identity increment is jumping in SQL Server database
... the SQL Server.
The solution is:
Run SQL Server Configuration Manager.
Select SQL Server Services.
Right-click SQL Server and select Properties.
In the opening window under Startup Parameters, type -T272 and click Add, then press Apply button and restart.
...
Possible to do a MySQL foreign key to one of two possible tables?
...ecific type of filter is easy if you know which type you want to join to:
SELECT * FROM Products
INNER JOIN FiltersType2 USING (product_id)
If you want the filter type to be dynamic, you must write application code to construct the SQL query. SQL requires that the table be specified and fixed at ...
How to get elements with multiple classes
...document.getElementsByClassName("class1 class2");
var list = document.querySelectorAll(".class1.class2");
OR (at least one class)
var list = document.querySelectorAll(".class1,.class2");
XOR (one class but not the other)
var list = document.querySelectorAll(".class1:not(.class2),.class2:not(.c...
Check if OneToOneField is None in Django
...fortunately, this doesn't work all the time. In case you want to work with select_related() now or in the future -- or maybe even to be sure you also handle other sorts of magic which may happen elsewhere -- you have to extend the test as follows: if hasattr(object, 'onetoonerevrelattr') and object....