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What is an existential type?
...r bottoms.
Since an existential is a pair, an existential argument can be converted to a universal one via currying.
(∃b. F(b)) -> Int
is the same as:
∀b. (F(b) -> Int)
The former is a rank-2 existential. This leads to the following useful property:
Every existentially quantifie...
What is the preferred/idiomatic way to insert into a map?
...l require an additional call to std::pair template constructor in order to convert to value_type (ie : adding const to first_type)
std::pair<int, int> will also require an additional call to the template constructor of std::pair in order to convert the parameter to value_type (ie : adding cons...
Spring MVC: How to return image in @ResponseBody?
...ing annotation. Example below works for me out of box. No need of register converter or anything else if you have web mvc enabled (@EnableWebMvc).
@ResponseBody
@RequestMapping(value = "/photo2", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALUE)
public byte[] testphoto() throws IOE...
Calculate a MD5 hash from a string
...nput);
byte[] hashBytes = md5.ComputeHash(inputBytes);
// Convert the byte array to hexadecimal string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
{
sb.Append(hashBytes[i].ToString("X2"));
}
...
How to convert a PIL Image into a numpy array?
Alright, I'm toying around with converting a PIL image object back and forth to a numpy array so I can do some faster pixel by pixel transformations than PIL's PixelAccess object would allow. I've figured out how to place the pixel information in a useful 3D numpy array by way of:
...
Iterate keys in a C++ map
...
EDIT::
In case you want to expose only the keys to outside then you can convert the map to vector or keys and expose.
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How does Task become an int?
...e without the await - with T foo = someTaskT; you'd get "Cannot implicitly convert type Task<T> to T" - in the same way I argue that it would make more sense to have a keyword for the inverse (wrapping in Task<T>). I'm all for removing fluff but in this case I think it provides an unnece...
Android: android.content.res.Resources$NotFoundException: String resource ID #0x5
...he error in setText() method
Solution is simple put your Integer value by converting into string type
as
textview.setText(Integer.toString(integer_value));
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Why does this code segfault on 64-bit architecture but work fine on 32-bit?
... cast the malloc return in C. The void* that it returns will be implicitly converted to a pointer of the correct type (unless you haven't included the header in which case it probably would have warned you of the potentially unsafe int-to-pointer conversion).
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How to calculate time elapsed in bash script?
...ed:
an integer that represents the count of elapsed seconds and
a way to convert such integer to an usable format.
An integer value of elapsed seconds:
There are two bash internal ways to find an integer value for the number of elapsed seconds:
Bash variable SECONDS (if SECONDS is unset it...