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C++ templates that accept only certain types
... class my_template<T*> {
...
};
// All other types are invalid, and will cause linker error messages.
[Minor EDIT 6/12/2013: Using a declared-but-not-defined template will result in linker, not compiler, error messages.]
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What is the difference between & and && in Java?
...& operator in Java is used for verifying whether both its boolean operands are true , and the & operator is used to do Bit-wise operations on two integer types.
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What does auto&& tell us?
...any initializer regardless of whether it is an lvalue or rvalue expression and I will preserve its constness. This is typically used for forwarding (usually with T&&). The reason this works is because a "universal reference", auto&& or T&&, will bind to anything.
You might s...
Maximum value for long integer
...t; type(sys.maxsize+1)
<type 'long'>
for integers we have
maxint and maxsize:
The maximum value of an int can be found in Python 2.x with sys.maxint. It was removed in Python 3, but sys.maxsize can often be used instead. From the changelog:
The sys.maxint constant was removed, since t...
How can I dynamically set the position of view in Android?
... to use setLayoutParams(...).
If you can limit your support to Honeycomb and up you can use the setX(...), setY(...), setLeft(...), setTop(...), etc.
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When would you use the Builder Pattern? [closed]
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The key difference between a builder and factory IMHO, is that a builder is useful when you need to do lots of things to build an object. For example imagine a DOM. You have to create plenty of nodes and attributes to get your final object. A factory is used whe...
Advantage of switch over if-else statement
...0 have an expected action (that presently is the same action). Performance and space need to be considered but are not critical. I've abstracted the snippet so don't hate me for the naming conventions.
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Generate random password string with requirements in javascript
...nerate random number, eg: 0.123456
.toString(36) // Convert to base-36 : "0.4fzyo82mvyr"
.slice(-8);// Cut off last 8 characters : "yo82mvyr"
Documentation for the Number.prototype.toString and string.prototype.slice methods.
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Why use pointers? [closed]
...tionality, missing data types or for pure perfomance. More below...
When and where should I use pointers?
Short answer here is: Where you cannot use anything else. In C you don't have any support for complex datatypes such as a string. There are also no way of passing a variable "by reference" ...
C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ctor、string或deque，则使用erase-remove习惯用法。
SeqContainer<int> c;
c.erase(remove(c.begin(),c.end(),1963),c.end());
如果容器是list，则使用list::remove。
如果容器是一个标准关联容器，则使用它的erase成员函数。
要删除容器中满足特定条件的...