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What do the following phrases mean in C++: zero-, default- and value-initialization?
... if T is a scalar type (3.9), the object is set to the value of 0 (zero) converted to T;
— if T is a non-union class type, each nonstatic data member and each base-class subobject is zero-initialized;
— if T is a union type, the object’s first named data member is zero-initialized;
— i...
How do I initialize an empty array in C#?
...
string[] a = { };
[The elements inside the bracket should be implicitly convertible to type defined, for instance, string[] a = { "a", "b" };]
Or yet another:
var a = Enumerable.Empty<string>().ToArray();
Here is a more declarative way:
public static class Array<T>
{
public s...
int to hex string
I need to convert an int to hex string.
4 Answers
4
...
Change type of varchar field to integer: “cannot be cast automatically to type integer”
...YPE integer USING (trim(col_name)::integer);
to strip white space before converting.
This shoud've been obvious from an error message if the command was run in psql, but it's possible PgAdmin-III isn't showing you the full error. Here's what happens if I test it in psql on PostgreSQL 9.2:
=> ...
Convert timedelta to total seconds
... 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix...
How do I use LINQ Contains(string[]) instead of Contains(string)
...le<T>, which has a Contains method. Therefore, it's not necessary to convert the array to an IList<T>. msdn.microsoft.com/en-us/library/19e6zeyy.aspx
– spoulson
Oct 13 '08 at 1:11
...
Signed versus Unsigned Integers
...
Another difference is when you are converting between integers of different sizes.
For example, if you are extracting an integer from a byte stream (say 16 bits for simplicity), with unsigned values, you could do:
i = ((int) b[j]) << 8 | b[j+1]
(shou...
What is the use of the %n format specifier in C?
...tput so far by this call to one of the fprintf() functions. No argument is converted.
An example usage would be:
int n_chars = 0;
printf("Hello, World%n", &n_chars);
n_chars would then have a value of 12.
share
...
Accessing the index in 'for' loops?
...95 you probably have the data in the wrong type (a string) and you need to convert it to an actual list of numbers instead of a string. That is somewhat off topic here, please delete your comment and flag mine to be deleted as no longer needed when you see this.
– Aaron Hall♦...
How do I provide custom cast support for my class?
... implicit operator byte[] (MyType x)
{
byte[] ba = // put code here to convert x into a byte[]
return ba;
}
or
public static explicit operator MyType(byte[] x)
{
if (!CanConvert)
throw new DataValueNullException();
// Factory to convert byte[] x into MyType
MyType mt ...