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Does JavaScript have “Short-circuit” evaluation?
...hort-circuit" evaluation.
if (true == true || foo.foo){
// Passes, no errors because foo isn't defined.
}
Live DEMO
if (false && foo.foo){
// Passes, no errors because foo isn't defined.
}
Live DEMO
sha...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...
repset:SECONDARY> show tables;
#输出
Sun Dec 29 21:50:48.590 error: { "$err" : "not master and slaveOk=false", "code" : 13435 } at src/mongo/shell/query.js:128
#mongodb默认是从主节点读写数据的，副本节点上不允许读，需要设置副本节点可以读。
repset:S...
Why must we define both == and != in C#?
...our compiled the code in the example program, you will see it runs with no errors. However, if you tried adding the line:
cout << (a != b);
you will get
compiler error C2678 (MSVC) : binary '!=' : no operator found which takes a left-hand operand of type 'Test' (or there is no acceptab...
Use of 'const' for function parameters
...o write int getDouble( const int a ){ //... } that will generate a compile error when finding ++a;.
– dom_beau
Mar 27 '17 at 3:58
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How do I iterate over an NSArray?
...ss the objects by index, you can run into strange exceptions or off-by-one errors (often long after the problem has occurred) that can be horrific to debug. Enumeration using one of the standard idioms has a "fail-fast" behavior, so the problem (caused by incorrect code) will manifest itself immedia...
What does the 'standalone' directive mean in XML?
...he actual effects of using standalone=yes.
Forces processors to throw an error when parsing documents with an external DTD or parameter entity references, if the document contains references to entities not declared in the internal DTD (with the exception of replacement text of parameter entities ...
C pointers : pointing to an array of fixed size
...s a pointer to an element
void foo(char p[])
is a major technique-level error, which unfortunately is rather widespread these days. A pointer-to-array technique is a much better approach in such cases.
Another reason that might hinder the adoption of the fixed-size array passing technique is the...
How do I create a right click context menu in Java Swing?
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After using the above code, I get the error saying that "The method addMouseListener(MouseListener) in the type Figure is not applicable for the arguments (PopClickListener)" Regards, Vinay
– user1035905
Nov 8 '11 at 15:31
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Does it make any sense to use inline keyword with templates?
... f<>(int) {} // OK: inline
template<> int g<>(int) {} // error: not inline
#endif
Compile this, et voila:
g++ a.cc b.cc
/tmp/ccfWLeDX.o: In function `int g<int>(int)':
inlinexx2.cc:(.text+0x0): multiple definition of `int g<int>(int)'
/tmp/ccUa4K20.o:inlinexx.cc:(.te...
Correct file permissions for WordPress [closed]
...from within the admin, with the constant FTP pop-up routine or permissions errors. Cannot add, nor update plugins. Only when I make www-data the owner of wp-content, does the Wordpress Admin plugin functionality work. (Example: sudo chown www-data:www-data -R /var/www/html/wp-content/)
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