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When would anyone use a union? Is it a remnant from the C-only days?
...own Variant type:
struct my_variant_t {
int type;
union {
char char_value;
short short_value;
int int_value;
long long_value;
float float_value;
double double_value;
void* ptr_value;
};
};
Then you would use it such as:
/* const...
What is the email subject length limit?
How many characters are allowed to be in the subject line of Internet email?
I had a scan of The RFC for email but could not see specifically how long it was allowed to be.
I have a colleague that wants to programmatically validate for it.
...
LEN function not including trailing spaces in SQL Server
..."returns the number of bytes used to represent any expression".
Example:
SELECT
ID,
TestField,
LEN(TestField) As LenOfTestField, -- Does not include trailing spaces
DATALENGTH(TestField) As DataLengthOfTestField -- Shows the true length of data, including trailing...
How do I check if an integer is even or odd? [closed]
...tring();
if (String.IsNullOrEmpty(foo))
return Evenness.Unknown;
char bar = foo[foo.Length - 1];
switch (bar)
{
case '0':
case '2':
case '4':
case '6':
case '8':
return Evenness.Even;
case '1':
case '3':
case '5':
case '7':
case...
Realistic usage of the C99 'restrict' keyword?
...ons could be saved, as mentioned by supercat.
Consider for example:
void f(char *restrict p1, char *restrict p2) {
for (int i = 0; i < 50; i++) {
p1[i] = 4;
p2[i] = 9;
}
}
Because of restrict, a smart compiler (or human), could optimize that to:
memset(p1, 4, 50);
memset(...
Splitting String with delimiter
...
Oh, and be careful if you're splitting on certain characters like a pipe |. You will need to escape the char stackoverflow.com/questions/3842537/…
– Snekse
Dec 23 '15 at 17:19
...
互联网运营人员必备的12款工具 - 资讯 - 清泛网 - 专注C/C++及内核技术
...人员可以通过它快速了解网站的各项运营数据、包括PV、IP、独立访客、来访次数、搜索关键词、地域分布、用户属性等多项统计指标，这样可以一目了然地了解网站的各项访问数据，运营人员可以根据统计数据及时调整页面内...
UINavigationController “back button” custom text?
...
You can set the text in the Interface Builder:
Select the navigation item of the ViewController that the back button would return to:
In the utilities panel attribute inspector, enter your label for the Back Button:
I would prefer this approach over setting the titl...
Differences and relationship between glActiveTexture and glBindTexture
...rent objects, and all of our object manipulation functions are adjusted to select from the current object.
When you change the currently active object, you change the entire set of target locations. So you can bind something that goes into current object 0, switch to current object 4, and will be m...
Why is C so fast, and why aren't other languages as fast or faster? [closed]
...what the machine does can be seen in the rules that govern the widening of char objects for use in expressions: whether the values of char objects widen to signed or unsigned quantities typically depends on which byte operation is more efficient on the target machine.
...