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Is object empty? [duplicate]
...suming that by empty you mean "has no properties of its own".
// Speed up calls to hasOwnProperty
var hasOwnProperty = Object.prototype.hasOwnProperty;
function isEmpty(obj) {
// null and undefined are "empty"
if (obj == null) return true;
// Assume if it has a length property with a...
boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
...name<<std::endl;
++p.first;
}
}
Note that hashing is automatically taken care of: boost::hash is specialized to hash a composite key as a function of the boost::hash values of its elements. Should we need to specify different hash functions for the elements of a composite key, we can e...
Initialization of an ArrayList in one line
...
@Eddie: Good call for the link -- one sentence on double-brace initialization isn't enough to describe it fully.
– coobird
Jun 17 '09 at 4:23
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The Use of Multiple JFrames: Good or Bad Practice? [closed]
...tween no component and visible component.
JInternalFrame/JDesktopPane typically used for an MDI.
JTabbedPane for groups of components.
JSplitPane A way to display two components of which the importance between one or the other (the size) varies according to what the user is doing.
JLayeredPane far ...
What data type to use for hashed password field and what length?
...ll be unique per user. However, any known salt makes the hash cryptographically weaker than if there were no known salt. A salt only adds value if it is also unknown.
– fijiaaron
May 18 '12 at 13:39
...
How to convert FileInputStream to InputStream? [closed]
...
You would typically first read from the input stream and then close it. You can wrap the FileInputStream in another InputStream (or Reader). It will be automatically closed when you close the wrapping stream/reader.
If this is a method re...
What is the “assert” function?
...r way:
int ret = foo();
assert(ret);
From the combination of the program calling abort() and not being guaranteed to do anything, asserts should only be used to test things that the developer has assumed rather than, for example, the user entering a number rather than a letter (which should be han...
Passing enum or object through an intent (the best solution)
...lization as it's all done in place thanks to inline which will replace the calls with the code inside the function.
The functions are more familiar as they are similar to the SDK ones.
The IDE will autocomplete these functions which means there is no need to have previous knowledge of the utility cl...
Fast stable sorting algorithm implementation in javascript
...ipt-y despite JavaScript's own native sort behavior. The function is also called mergeSort and not sort, so it's not intended as a drop in replacement. Sometimes you just need a stable merge sort, e.g. when sorting tables by column.
– Justin Force
Mar 4 '14 at...
What is the difference between association, aggregation and composition?
...t is owned by the object of it's owning class cannot live on it's own(Also called "death relationship"). It will always live as a part of it's owning object where as in Aggregation the dependent object is standalone and can exist even if the object of owning class is dead.
So in composition if owni...