ConceptStatic Collider: objects are checked for static statics, with Collider components and no rigidbody components.The trap of the static collision bodyWhen the game is initialized, unity merges all the static collisions into a large collider,unity that the objects cannot be moved in the game. But if you accidentally move the positions of these static collisions (which can be moved) in the game, it can cause a serious performance problem, and all the other static collisions that merge with the
DWORD ptr [ebp-104h],ecx 0008506E mov edx,dword ptr [ebp-104h]00085074mov DWORD ptr [Result],edxAvoid compiler generation of type conversions other than expected by explicitly calling ' Test.m_value (). C_STR () '.But remember what I said at the beginning of this article, this problem can be avoided by very good code specification, the method we need to use here is ' explicit '. By defining the constructor with one parameter as ' explicit ', we can avoid the compiler's implicit invocation of th
each function has its own num copy, and if you want to modify NUM, you must declare it with the global keyword. Like the following.6: How do I exchange two variable values using one line of code?For:Question 7: How do I add code so that no defined method calls the Mydefault method?For:The test of this question is the default method of Python, which calls method __getattr__ only if there are no method calls defined. When the Fn1 method passes in the parameter, we can add a *args indeterminate pa
The difference of map::erase function in different versions of STL
1. c++98 and C++11 standardshttp://www.cplusplus.com/reference/map/map/erase/ 2.PJ STL (Windows) map::erase function (C++11 standard) returns a map::iterator: iterator Map::erase(const_iterator _where); iterator Map::erase(const_iteratorconst_iterator _last); size_type Map::erase(constkey_type _keyval);3. SGI STL (Linux) The Linux implementation version of the Map::erase function (c++98 standard) returns a void:v
Bindings
Events are a very complex topic in JavaScript. The times when we used inline Oncick events have passed.
We should use event bubbling or delegation.
For example, if we need to show a group of pictures to Lightbox window. So the following code you should never use.
Here we use jquery as an example.
Html:
.......
Javascript (not recommended):
$ (' a '). On (' click ', function () {
Calllightbox (this);
});
Writing this way causes bind
Interview Trap questions:
int i=0=i++;
At this point I value:
I end up being 0;
When executing i=i++, the assignment symbol has the lowest priority and executes the i++ first;
Execute i++, the program first put I value 0 into the stack, and then the I to operate + +;
After i++ i is 1;
Finally, the assignment is performed, the data in the stack is 0 popped, assigned to I, again i is 0;
Therefore, best practice one: Do not assign values of the same variable more than once
statement, return the value saved in the local variable table
Note: If you also use a return statement in Finally, such as return ++x. Then Y will be 3. Because the specification specifies that when both try and finally have a return, the return of the try is ignored and the return of finally is used.Code Listing 3: Public Static intTest () {intCount = 5; Try { Throw NewNullPointerException ("Exception error"); } finally{System.out.println ("Finally"); returncount; } } P
(a >= 2 (b = 3) >= 3) { System.out.println (" condition 3"); } System.out.println (b); System.out.println (c); }Look at the output: Conditions 1230This symbol does not produce a short-circuit function and will be judged below.Polymorphic This is very familiar to programmers, familiar with me or to say that the internet is much better, first polymorphic should be a run-time behavior, this is particularly important! Many places on the web say that rewr
There are now two tables, table1 and Table2,table1 have 10 million data (ID primary key index), Table2 has three data (UID field 3,5,7);Select * from where inch Select from table2);A blink of an eye feels that the sentence should be quick; you might be wishful thinking that you execute the statement inside the parentheses and then execute the outer Select, and the outer select uses the ID primary key speed to fly.Actually this statement executes very slowly, I test 20s here;Through explain ana
the engine I choose is MyISAM or InnoDB? Or, do I decide that the output data is in CSV format?Motive for profitAlthough MySQL is a successful open-source product, it is still a business, full of professional developers who get paid by it. While most users continue to enjoy the best possible experience from an open source license, the company is no doubt struggling to earn enough money to keep it running. This leads to a strange divergence between the "Community Edition" and the complete produc
1. Pointers and Arrays
The arrays in C language are worth noting:
1) in C language, there is only one-dimensional array, and the array size must be determined by the compiler as a constant. The elements of arrays in C language can be any type,
Symbol token: A Basic Information Unit in a program. Lexical Analysis: divides programs into symbols.
1. Greedy rules in lexical analysis
If the (compiler) input stream has been decomposed into symbols before a character, the next symbol will
When using Python, a pit of the Strip () command was found.The previous understanding of strip (x) is to remove the "x" string that is contained at the beginning and end, if not included, without removing it.Here's a pit: Python's handling of string
The trick is to set the touch-sensitive area of the button, which can actually be divided into two parts:
Visual target (Visual Targe)-the area that the user can see and want to click on.
Second, touch sensing area-users can not see, used to
Beginners of delphii, for a variety of reasons, many of the concepts in the delphii can not be well understood, and thus brought many problems, or the development of the program stability is not good, a will be able to run, a will not run; or
Today, advertising hanging horse, window ads has not been a new phenomenon, especially the rampant proliferation of some bad websites, greatly increased the chance of computer-infected Trojan virus. Moreover, this kind of website has the serious
Source Address: http://blog.csdn.net/niannian_315/article/details/24354251Today in the use of BigDecimal "inexplicable" phenomenon, although know to avoid use, but did not study. Take this opportunity to check and share the details of your
Recently developed a new feature, encountered a lot of problems, and so have time will be summarized in turn, one of the problems is that the HTML element of the Contenteditable=false in IE (edge), will occasionally or can be edited situation, check
All the functions you create are case-sensitive.
Single quotes (' Strings ') and double quotes ("strings") have no special distinction in JavaScript, and can be used to create strings. But as a general rule, most Web developers choose to use single
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