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Eager load polymorphic
...ssociations are only supported by preload. It's in the documentation here: http://api.rubyonrails.org/v5.1/classes/ActiveRecord/EagerLoadPolymorphicError.html
So always use preload for polymorphic associations. There is one caveat for this: you cannot query the polymorphic assocition in where claus...
__FILE__, __LINE__, and __FUNCTION__ usage in C++
...kely dominate at some point in the future when C++20 becomes widespread:
https://en.cppreference.com/w/cpp/utility/source_location
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1208r5.pdf
The documentation says:
constexpr const char* function_name() const noexcept;
6 Returns:...
Comparing object properties in c# [closed]
...roperties and methods).
/// </summary>
/// <see cref="http://stackoverflow.com/questions/2442534/how-to-test-if-type-is-primitive"/>
public static bool IsSimpleType(
this Type type)
{
return
type.IsValueType ||
type.IsPrim...
Why is HttpClient BaseAddress not working?
...relative URI passed to the GetAsync method -- or whichever other method of HttpClient -- only one permutation works. You must place a slash at the end of the BaseAddress, and you must not place a slash at the beginning of your relative URI, as in the following example.
using (var handler = new Htt...
List all svn:externals recursively?
...f the external.. ie if i have lib\my_ex as an external i only get my_ex http:/svnlinkhere
– ShoeLace
Jun 17 '09 at 15:47
4
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Generate random numbers uniformly over an entire range
...;< "\n";
}
Even if one is not interested in the library, the website (http://www.pcg-random.org/) provides many interesting articles about the theme of random number generation in general and the C++ library in particular.
Boost.Random
Boost.Random (documentation) is the library which inspire...
How to override trait function and call it from the overridden function?
...TraitChildClass())->calc(2); // will print 6.5
You can see it work at http://sandbox.onlinephpfunctions.com/code/e53f6e8f9834aea5e038aec4766ac7e1c19cc2b5
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C++, Free-Store vs Heap
...
See http://www.gotw.ca/gotw/009.htm; it can describe the differences between the heap and the free-store far better than I could:
Free-store:
The free store is one of the two
dynamic memory areas, allocated/freed
by new/...
Is there a difference between foo(void) and foo() in C++ or C?
...
C++11 N3337 standard draft
There is no difference.
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf
Annex C "Compatibility" C.1.7 Clause 8: declarators says:
8.3.5 Change: In C ++ , a function declared with an empty parameter list takes no arguments. In ...
Python strptime() and timezones?
...me string is similar to the time format in rfc 2822 (date format in email, http headers). You could parse it using only stdlib:
>>> from email.utils import parsedate_tz
>>> parsedate_tz('Tue Jun 22 07:46:22 EST 2010')
(2010, 6, 22, 7, 46, 22, 0, 1, -1, -18000)
See solutions that...