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Undefined reference to static constexpr char[]
...he same semantics as a function declared inline: it can be defined, identically, in
multiple translation units, must be defined in every translation unit in which it is odr-used, and
the behavior of the program is as if there is exactly one variable.
and modified [basic.def]p2:
A declar...
Difference between fprintf, printf and sprintf?
...flavors are very certainly in the C standard.
– Fred Foo
Jan 7 '11 at 16:31
@larsmans: ah, ok. thanks for the correc...
What does enumerable mean?
...his condition is in place because objects have many more properties, especially from inheritance:
console.log(Object.getOwnPropertyNames(Object.prototype));
// ["constructor", "toString", "toLocaleString", "valueOf", "hasOwnProperty", "isPrototypeOf", "propertyIsEnumerable", /* etc. */]
Each of t...
Curious null-coalescing operator custom implicit conversion behaviour
...l; there's no need to check it for null a second time just because we are calling a lifted conversion operator". We'd them optimize it away to just
new int?(op_Implicit(temp2.Value))
My guess is that we are somewhere caching the fact that the optimized form of (int?)Foo() is new int?(op_implici...
Interface type check with Typescript
...
And if the interface has 100 members, you need to check all 100? Foobar.
– Jenny O'Reilly
Nov 24 '17 at 10:43
6
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Why is null an object and what's the difference between null and undefined?
...nown what the value is.
One thing to remember is that null is not, conceptually, the same as false or "" or such, even if they equate after type casting, i.e.
name = false;
You: What is name?
JavaScript: Boolean false.
name = '';
You: What is name?
JavaScript: Empty string
*: name in this context...
asp.net mvc: why is Html.CheckBox generating an additional hidden input
...uffinMan: This is not silly option. Lets say your view model has property called IsActive, which is initiated to true in constructor. User deselects checkbox, but since value is not sent to server, model binder doesn't pick it up, and property value is not changed. Model binder shouldn't assume, tha...
Creating an instance of class
...
/* 1 */ Foo* foo1 = new Foo ();
Creates an object of type Foo in dynamic memory. foo1 points to it. Normally, you wouldn't use raw pointers in C++, but rather a smart pointer. If Foo was a POD-type, this would perform value-initial...
Import multiple csv files into pandas and concatenate into one DataFrame
...
If you have same columns in all your csv files then you can try the code below.
I have added header=0 so that after reading csv first row can be assigned as the column names.
import pandas as pd
import glob
path = r'C:\DRO\DCL_rawdata_files' # use you...
Is Ruby pass by reference or by value?
...en I perform a save on the @user object I lose the errors that were initially stored in the lang_errors variable.
13 An...