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entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding relat
...exception "ADO.Net Entity Framework An entity object cannot be referenced by multiple instances of IEntityChangeTracker"
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Is cout synchronized/thread-safe?
...ation) are guaranteed to be mutually exclusive, the buffer might be shared by the different threads. This will quickly lead to corruption of the internal state of the stream.
And even if access to the buffer is guaranteed to be thread-safe, what do you think will happen in this code?
// in one thr...
Check whether number is even or odd
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@crush n % 2 == 0 semantically means Divide by 2 and check if the remainder is 0, which is much clearer than n & 1 == 0 which means Zero all the bits but leave the least significant bit unchanged and check if the result is 0. The improved clarity of the first is wo...
Override intranet compatibility mode IE8
By default IE8 forces intranet websites into compatibility mode. I tried changing the meta header to IE8, but it doesn't acknowledge the meta header and just uses the browser setting. Does anyone know how to disable this?
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Purpose of Python's __repr__
...ng a printable representation of an object. This is the same value yielded by conversions (reverse quotes). It is sometimes useful to be able to access this operation as an ordinary function. For many types, this function makes an attempt to return a string that would yield an object with the same v...
How to speed up insertion performance in PostgreSQL
... no practical limit AFAIK, but batching will let you recover from an error by marking the start of each batch in your input data. Again, you seem to be doing this already.
Use synchronous_commit=off and a huge commit_delay to reduce fsync() costs. This won't help much if you've batched your work int...
SQL DROP TABLE foreign key constraint
... still the same 'Could not drop object 'my_table' because it is referenced by a FOREIGN KEY constraint.
– FrenkyB
Nov 16 '15 at 13:00
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Where are ${EXECUTABLE_NAME} and ${PRODUCT_NAME} defined
...the target's Build Settings in the Packaging section. It has the same name by default as your project.
Edit:
While PRODUCT_NAME is by default the name of the Target (MyDemoApp in this case). The EXECUTABLE_NAME is a concatenation of:
$EXECUTABLE_PREFIX, $PRODUCT_NAME and $EXECUTABLE_SUFFIX.
Se...
How to negate specific word in regex? [duplicate]
...onstruct is the pair of parentheses, with the opening parenthesis followed by a question mark and an exclamation point. Inside the lookahead [is any regex pattern].
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Is module __file__ attribute absolute or relative?
...pathname of the shared library file.
From the mailing list thread linked by @kindall in a comment to the question:
I haven't tried to repro this particular example, but the reason is
that we don't want to have to call getpwd() on every import nor do we
want to have some kind of in-process ...