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SQLite DateTime comparison
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Sqlite can not compare on dates. we need to convert into seconds and cast it as integer.
Example
SELECT * FROM Table
WHERE
CAST(strftime('%s', date_field) AS integer) <=CAST(strftime('%s', '2015-01-01') AS integer) ;
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When should you use 'friend' in C++?
...t;typename Derived>
struct Policy {
void doSomething() {
// casting this to Derived* requires us to see that we are a
// base-class of Derived.
some_type const& t = static_cast<Derived*>(this)->getSomething();
}
};
// note, derived privately
template...
Execute JavaScript using Selenium WebDriver in C#
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I find it awkward that I have to cast the driver. Why is ExecuteJavascript not just a method on the driver?
– Kolob Canyon
Jun 27 '19 at 18:05
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convert a list of objects from one type to another using lambda expression
...ound when (or if) it can be used. I just tried it and was getting a cannot cast expression exception
– Collin M. Barrett
Aug 1 '18 at 16:26
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What is the difference between == and Equals() for primitives in C#?
...t, so you aren't calling it.
You could force it to call this method with a cast:
Console.WriteLine(newAge.Equals((short)age)); // true
This will call short.Equals(short) directly, without boxing. If age is larger than 32767, it will throw an overflow exception.
You could also call the short.Equals(...
error C2440: \'initializing\' : cannot convert from \'char *\' to \'co...
...har> > *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
//输出一行中所有字符
void printchar(string &line)
{
istringstream iss(line);
string word;
while(iss>>word)
for(vector<string>::const_...
How do you disable browser Autocomplete on web form field / input tag?
...om the user.
We are the third browser to implement this change, after IE and Chrome.
According to the Mozilla Developer Network documentation, the Boolean form element attribute autocomplete prevents form data from being cached in older browsers.
<input type="text" name="foo" autocomplete...
C++ catch blocks - catch exception by value or reference? [duplicate]
...onst object and catch it with a non-const reference. To avoid this silent "casting away" of const, always catch a const reference, and ensure your exception types have const-correct accessors.
– Daniel Earwicker
Mar 26 '10 at 10:01
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How do you convert a DataTable into a generic list?
... System.Data.DataSetExtensions.dll,
List<DataRow> rows = table.Rows.Cast<DataRow>().ToList();
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Get current date in milliseconds
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Casting the NSTimeInterval directly to a long overflowed for me, so instead I had to cast to a long long.
long long milliseconds = (long long)([[NSDate date] timeIntervalSince1970] * 1000.0);
The result is a 13 digit times...