大约有 40,000 项符合查询结果（耗时：0.0366秒） [XML]
Is it safe to ignore the possibility of SHA collisions in practice?
...ty of such an event occurring in the next second to about 10-15. That's 45 orders of magnitude more probable than the SHA-256 collision. Briefly stated, if you find SHA-256 collisions scary then your priorities are wrong.
In a security setup, where an attacker gets to choose the messages which will...
How to determine if binary tree is balanced?
...ion cost. You spend a lot of time doing unnecessary tree rearrangements in order to attain a level of balance that in practice makes little difference. Who cares if sometimes it takes forty branches to get to the farthest leaf in a million-node imperfectly-balanced tree when it could in theory take ...
How can I get the external SD card path for Android 4.0+?
...
In order to retrieve all the External Storages (whether they are SD cards or internal non-removable storages), you can use the following code:
final String state = Environment.getExternalStorageState();
if ( Environment.MEDIA_...
CSS last-child selector: select last-element of specific class, not last child inside of parent?
...t.
body {
background: black;
}
.comment {
width: 470px;
border-bottom: 1px dotted #f0f0f0;
margin-bottom: 10px;
}
.comment:last-of-type {
border-bottom: none;
margin-bottom: 0;
}
<div class="commentList">
<article class="comment " id="com21"></artic...
Is there a better way to express nested namespaces in C++ within the header
...ESPACE_BEGIN(Foo, Bar, Baz)
class X { };
NAMESPACE_END(Baz, Bar, Foo) // order doesn't matter, NAMESPACE_END(a, b, c) would work equally well
Foo::Bar::Baz::X x;
For nesting deeper than three levels you would have to add helper macros up to the desired count.
...
Why should eval be avoided in Bash, and what should I use instead?
...>&3 2>&1 # Redirect stdout to &3, and stderr to stdout: order matters
command <&3 >&4 # Input and output!
Variable indirection
Scenario:
VAR='1 2 3'
REF=VAR
Bad:
eval "echo \"\$$REF\""
Why? If REF contains a double quote, this will break and open the code...
Declaring variables inside or outside of a loop
...f having to go all over your entire code base and tweak and hack things in order to squeeze clock cycles here and there.
share
|
improve this answer
|
follow
|...
When do I need to use a semicolon vs a slash in Oracle SQL?
...e 1:
ORA-00942: table or view does not exist
The / is mainly required in order to run statements that have embedded ; like a CREATE PROCEDURE statement.
share
|
improve this answer
|
...
What are the disadvantages of using persistent connection in PDO
...
I hope I had read this answer before running SELECT orders.* FROM orders LEFT JOIN items USING(item_id)
– Ast Derek
Jul 26 '10 at 18:09
31
...
When to use inline function and when not to use it?
...f the library call the old implementation
when developing a library, in order to make a class extensible in the future you should:
add non-inline virtual destructor even if the body is empty
make all constructors non-inline
write non-inline implementations of the copy constructor and assignment...