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Check if a variable is of function type
...swered Sep 9 '11 at 2:24
Alex GrandeAlex Grande
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How do I remove code duplication between similar const and non-const member functions?
...a detailed explanation, please see the heading "Avoid Duplication in const and Non-const Member Function," on p. 23, in Item 3 "Use const whenever possible," in Effective C++, 3d ed by Scott Meyers, ISBN-13: 9780321334879.
Here's Meyers' solution (simplified):
struct C {
const char & get()...
How to convert byte array to string and vice versa?
I have to convert a byte array to string in Android, but my byte array contains negative values.
22 Answers
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Detect backspace in empty UITextField
... answered Dec 30 '09 at 23:10
AndrewAndrew
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Can C++ code be valid in both C++03 and C++11 but do different things?
Is it possible for C++ code to conform to both the C++03 standard and the C++11 standard, but do different things depending on under which standard it is being compiled?
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Efficient evaluation of a function at every cell of a NumPy array
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You could just vectorize the function and then apply it directly to a Numpy array each time you need it:
import numpy as np
def f(x):
return x * x + 3 * x - 2 if x > 0 else x * 5 + 8
f = np.vectorize(f) # or use a different name if you want to keep the...
Convenient C++ struct initialisation
...you don't have to wait, because they are officialy supported by GCC, Clang and MSVC.
#include <iostream>
#include <filesystem>
struct hello_world {
const char* hello;
const char* world;
};
int main ()
{
hello_world hw = {
.hello = "hello, ",
.world = "worl...
See line breaks and carriage returns in editor
...es anyone know of a text editor on Linux that allows me to see line breaks and carriage returns? Does Vim support this feature?
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Difference between applicationContext.xml and spring-servlet.xml in Spring Framework
...ise conflict in the same context. As an example you may have ReST services and standard views, you may then have different view resolvers or security concerns for the services as to the views.
– Brett Ryan
Apr 3 '13 at 17:19
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There is no ViewData item of type 'IEnumerable' that has the key 'xxx'
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Ok, so the answer was derived from some other posts about this problem and it is:
If your ViewData contains a SelectList with the same name as your DropDownList i.e. "submarket_0", the Html helper will automatically populate your DropDownList with that data if you don't specify the 2nd paramete...