大约有 16,000 项符合查询结果（耗时：0.0299秒） [XML]
Where to store global constants in an iOS application?
...
There's two issues I ran into with this solution. First, when I used #decalare, I got a compile error saying "invalid preprocessing directive declare". So I changed it to #define instead. The other problem is using the constant. I wanted to create an...
Useful GCC flags for C
...
Several of the -f code generation options are interesting:
The -ftrapv function will cause the program to abort on signed integer overflow (formally "undefined behaviour" in C).
-fverbose-asm is useful if you're compiling with -S to examine the assembly output - it add...
super() raises “TypeError: must be type, not classobj” for new-style class
...super() cannot be used with an old-style class".
However, the important point is that the correct test for "is this a new-style instance (i.e. object)?" is
>>> class OldStyle: pass
>>> instance = OldStyle()
>>> issubclass(instance.__class__, object)
False
and not (as i...
Why doesn't std::queue::pop return value.?
... this scenario (with a naive/made up pop implementation, to ilustrate my point):
template<class T>
class queue {
T* elements;
std::size_t top_position;
// stuff here
T pop()
{
auto x = elements[top_position];
// TODO: call destructor for elements[top_positi...
Android screen size HDPI, LDPI, MDPI [duplicate]
...
Check out this awesome converter. http://labs.rampinteractive.co.uk/android_dp_px_calculator/
share
|
improve this answer
|
...
Android - Spacing between CheckBox and text
...DisplayMetrics().density;
checkBox.setPadding(checkBox.getPaddingLeft() + (int)(10.0f * scale + 0.5f),
checkBox.getPaddingTop(),
checkBox.getPaddingRight(),
checkBox.getPaddingBottom());
This gives you the following, where the green line is the increase in padding. This is...
When is “i += x” different from “i = i + x” in Python?
...s is why
i = 1
i += 1
seems to increment i. In reality, you get a new integer and assign it "on top of" i -- losing one reference to the old integer. In this case, i += 1 is exactly the same as i = i + 1. But, with most mutable objects, it's a different story:
As a concrete example:
a = [1,...
Showing Difference between two datetime values in hours
...her example of subtracting two dates in C# ...
if ( DateTime.Now.Subtract(Convert.ToDateTime(objDateValueFromDatabase.CreatedOn)).TotalHours > 24 )
{
...
}
share
|
improve this answer
...
Testing if object is of generic type in C#
...t.GetType().GetGenericTypeDefinition() == typeof(List<>);
As Jon points out, this checks the exact type equivalence. Returning false doesn't necessarily mean list is List<T> returns false (i.e. the object cannot be assigned to a List<T> variable).
...
How can I tell jackson to ignore a property for which I don't have control over the source code?
...
You can use Jackson Mixins. For example:
class YourClass {
public int ignoreThis() { return 0; }
}
With this Mixin
abstract class MixIn {
@JsonIgnore abstract int ignoreThis(); // we don't need it!
}
With this:
objectMapper.getSerializationConfig().addMixInAnnotations(YourClas...