大约有 40,000 项符合查询结果（耗时：0.0470秒） [XML]
Performance surprise with “as” and nullable types
...ypes. The JIT compiler generates a call to a CLR helper function named JIT_Unbox_Nullable to get the job done. This is a general purpose function for any value type, lots of code there to check types. And the value is copied. Hard to estimate the cost since this code is locked up inside mscorwks...
Setting variable to NULL after free
... only not best practice, it's wrong. For example: foo* bar=getFoo(); /*more_code*/ free(bar); /*more_code*/ return bar != NULL;. Here, setting bar to NULL after the call to free will cause the function to think it never had a bar and return the wrong value!
– David Schwartz
...
How to set the current working directory? [duplicate]
...
Perhaps this is what you are looking for:
import os
os.chdir(default_path)
share
|
improve this answer
|
follow
|
...
How to check the version before installing a package using apt-get?
...s-tools (= 2:2.8.4-2), adduser
Filename: pool/universe/r/redis/redis-server_2.8.4-2_amd64.deb
Size: 267446
MD5sum: 066f3ce93331b876b691df69d11b7e36
SHA1: f7ffbf228cc10aa6ff23ecc16f8c744928d7782e
SHA256: 2d273574f134dc0d8d10d41b5eab54114dfcf8b716bad4e6d04ad8452fe1627d
Description-en: Persistent key-v...
indexOf method in an object array?
...ethod for doing exactly what Pablo's anonymous map method does.
var idx = _.chain(myArray).pluck("hello").indexOf("Stevie").value();
share
|
improve this answer
|
follow
...
if checkbox is checked, do this
...checked
here is my algorithm...
create a global variable lets say var check_holder
check_holder has 3 states
undefined state
0 state
1 state
If the checkbox is clicked,
$(document).on("click","#check",function(){
if(typeof(check_holder)=="undefined"){
//this means that it is th...
Make var_dump look pretty
I have a simple $_GET[] query var set for showing testing data when pulling down queries from the DB.
13 Answers
...
How to download an entire directory and subdirectories using wget?
...ader: wget -r -l1 --no-parent http://www.stanford.edu/~boyd/cvxbook/cvxbook_additional_exercises/ was the answer for me. Thanks your answer.
– isomorphismes
Jun 21 '14 at 17:05
2
...
std::unique_ptr with an incomplete type won't compile
I'm using the pimpl-idiom with std::unique_ptr :
6 Answers
6
...
What is WEB-INF used for in a Java EE web application?
...e following structure :
ApplicationName
|
|--META-INF
|--WEB-INF
|_web.xml <-- Here is the configuration file of your web app(where you define servlets, filters, listeners...)
|_classes <--Here goes all the classes of your webapp, following the package structure you ...