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C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
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第17条：使用“swap技巧”出去多余的容量。
vector<Contestant>(contestants).swap(contestants);
表达式vector<Contestant>(contestants)创建一个临时的矢量，它是contestants的拷贝：这是由 vector的拷贝构造函数来完成的。然而，vector的拷贝构造函...
Why does `a == b or c or d` always evaluate to True?
...= "Inbar":
Compose a sequence of valid values, and use the in operator to test for membership:
if name in {"Kevin", "Jon", "Inbar"}:
In general of the two the second should be preferred as it's easier to read and also faster:
>>> import timeit
>>> timeit.timeit('name == "Kevin" ...
How to check if a file is a valid image file?
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That won't be sufficient if he's really testing for "valid" images; the presence of a magic number doesn't guarantee that the file hasn't been truncated, for example.
– Ben Blank
May 20 '09 at 18:11
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How do I step out of a loop with Ruby Pry?
... use when you're using guard and just want it to stop running pry for that test run. It'll reset on the next test run.
– BBonifield
Aug 26 '15 at 19:33
add a comment
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What does jQuery.fn mean?
...rom the constructor's prototype.
A simple constructor function:
function Test() {
this.a = 'a';
}
Test.prototype.b = 'b';
var test = new Test();
test.a; // "a", own property
test.b; // "b", inherited property
A simple structure that resembles the architecture of jQuery:
(function() {
var ...
What is a good regular expression to match a URL? [duplicate]
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For got to mention use this site gskinner.com/RegExr to test Regex and view common samples
– Daveo
Sep 28 '10 at 3:16
8
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How to get arguments with flags in Bash
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This is the idiom I usually use:
while test $# -gt 0; do
case "$1" in
-h|--help)
echo "$package - attempt to capture frames"
echo " "
echo "$package [options] application [arguments]"
echo " "
echo "options:"
echo "-h, --h...
Comparing object properties in c# [closed]
... snippet of code that would do something similar to help with writing unit test. Here is what I ended up using.
public static bool PublicInstancePropertiesEqual<T>(T self, T to, params string[] ignore) where T : class
{
if (self != null && to != null)
{
Type type ...
Python assigning multiple variables to same value? list behavior
...>>> a
1
>>> b
2
>>> c
3
>>> a,b,c = ({'test':'a'},{'test':'b'},{'test':'c'})
>>> a
{'test': 'a'}
>>> b
{'test': 'b'}
>>> c
{'test': 'c'}
>>>
share
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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...int(const char *format,...)
__attribute__((format(printf,1,2)));
void test()
{
myprint("i=%d/n",6);
myprint("i=%s/n",6);
myprint("i=%s/n","abc");
myprint("%s,%d,%d/n",1,2);
}
运行$gcc –Wall –c attribute.c attribute后，输出结果为：
attribute...