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When to use IComparable Vs. IComparer
I'm trying to figure out which of these interfaces I need to implement. They both essentially do the same thing. When would I use one over the other?
...
Java `final` method: what does it promise?
...ing class.
Reliability and Contract -- Objects are composed of primitives (int, char, double, etc.) and/or other Objects. Not all operations applicable to those components should be applicable or even logical when they are used in the bigger Object. Methods with the final modifier can be used to ens...
How to do INSERT into a table records extracted from another table
... that extracts and transforms data from a table and then insert those data into another table. Yes, this is a data warehousing query and I'm doing it in MS Access. So basically I want some query like this:
...
菜单的背景颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...//设置菜单项左边的位图
函数定义:BOOL SetMenuItemBitmaps( UINT nPosition, UINT nFlags, const CBitmap* pBmpUnchecked, const CBitmap* pBmpChecked );
nPostion指明具体要设置的菜单项,可以是菜单项索引,菜单项ID,具体由nFlags参数指明,为MF_BYPOSITION,...
Reshaping data.frame from wide to long format
I have some trouble to convert my data.frame from a wide table to a long table.
At the moment it looks like this:
9 Answe...
Check orientation on Android phone
...n().orientation;
You can check for orientation by looking at its value:
int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
// In landscape
} else {
// In portrait
}
More information can be found in the Android Devel...
Hibernate: hbm2ddl.auto=update in production?
...l, such as pushing the length of a String column up over 255 and seeing it convert to text, mediumtext, etc etc.
Granted, I don't think there is really a way to "convert datatypes" with without creating a new column, copying the data and blowing away the old column. But the minute your database ha...
Elegant solution to duplicate, const and non-const, getters? [duplicate]
...nst, and casting away the const is allowed.
class Foo
{
public:
const int& get() const
{
//non-trivial work
return foo;
}
int& get()
{
return const_cast<int&>(const_cast<const Foo*>(this)->get());
}
};
...
Resolve Type from Class Name in a Different Assembly
...iedName}");
string typeName = match.Groups["name"].Value;
int n = int.Parse(match.Groups["count"].Value);
string asmName = match.Groups["assembly"].Value;
string subtypes = match.Groups["subtypes"].Value;
typeName = typeName + $"`{n}";
Type genericTy...
Nullable ToString()
...also protects you from nulls. For ToString() it's not necessary (as you pointed out) but for default int values (for example) it works nicely, e.g.:
int page = currentPage ?? 1;
that lets you do all the integer operations on page w/o first explicitly null checking and calling for the value in cu...