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How to find if a given key exists in a C++ std::map
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m.find == m.end() // not found
If you want to use other API, then find go for m.count(c)>0
if (m.count("f")>0)
cout << " is an element of m.\n";
else
cout << " is not an element of m.\n";
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Copying files from one directory to another in Java
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There is no file copy method in the Standard API (yet). Your options are:
Write it yourself, using a FileInputStream, a FileOutputStream and a buffer to copy bytes from one to the other - or better yet, use FileChannel.transferTo()
User Apache Commons' FileUtils
Wait...
Node.js get file extension
...owfish's answer pointed out, and not write your own. More info: nodejs.org/api/path.html#path_path_extname_p
– xentek
Feb 23 '14 at 6:20
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Entity Framework: One Database, Multiple DbContexts. Is this a bad idea? [closed]
...he OnModelCreating method of you DbContext derived class (where the Fluent-API configuration is).
This will work in EF6:
public partial class CustomerModel : DbContext
{
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.HasDefaultSchema("Customer...
history.replaceState() example?
...reference on Webkit and Mozilla.
Also Opera on the introduction of History API said it wasn't using the title parameter and probably still doesn't.
Currently the 2nd argument of pushState and replaceState — the title
of the history entry — isn't used in Opera's implementation, but may
be...
How do I check that a Java String is not all whitespaces?
...nk(CharSequence)
https://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/StringUtils.html#isBlank-java.lang.CharSequence-
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How to read the database table name of a Model instance?
...the _meta property is not protected. It is a documented part of the public API. It is prefixed with the leading underscore to avoid conflicts with names that people may actually want to use on their models.
– Ryan Hiebert
Jun 26 '18 at 14:47
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Difference between OperationCanceledException and TaskCanceledException?
..., as there aren't any actual tasks involved (at least as far as the public API is concerned). See BlockingCollection.TryTake for an example.
I would catch the OperationCanceledException just in case the task is cancelled due to an operation which itself just threw OperationCanceledException - you p...
Create a unique number with javascript time
...ance.now().toString().replace('.', 7) developer.mozilla.org/en-US/docs/Web/API/Performance/now
– Itzik Ben Hutta
Oct 7 '17 at 21:48
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How do I format a date in Jinja2?
...ample for custom filters in the documentation: http://jinja.pocoo.org/docs/api/#custom-filters
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