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c/c++ volatile和mutable关键字 - C/C++ - 清泛网 - 专注C/C++及内核技术
...olatile 吗？解释为什么。
3); 下面的函数有什么错误：
int square(volatile int *ptr)
{
return *ptr * *ptr;
}
下面是答案：
1)是的。一个例子是只读的状态寄存器。它是volatile因为它可能被意想不到地改变。它是const因为程序不应该...
shared_ptr指针被赋值后，原指针会引用清零、自动释放。 - C/C++ - 清泛IT...
...赋值后，原指针会引用清零、自动释放。
std::shared_ptr<int> intg;
void foo(std::shared_ptr<int> p)
{
intg = p; // 原指针释放，存储新的智能指针
//*(intg.get()) = *(p.get...
C++, What does the colon after a constructor mean? [duplicate]
...nitialise m_val based on the constructor parameter:
class Demo
{
Demo(int& val)
{
m_val = val;
}
private:
const int& m_val;
};
By the C++ specification, this is illegal. We cannot change the value of a const variable in the constructor, because it is marked as ...
Byte order mark screws up file reading in Java
...de> value.
*/
public final byte[] getBytes()
{
final int length = bytes.length;
final byte[] result = new byte[length];
// Make a defensive copy
System.arraycopy(bytes,0,result,0,length);
return result;
}
private BOM(final byte bom[], fin...
Split string to equal length substrings in Java
...
Here's the regex one-liner version:
System.out.println(Arrays.toString(
"Thequickbrownfoxjumps".split("(?<=\\G.{4})")
));
\G is a zero-width assertion that matches the position where the previous match ended. If there was no previous match, it matches the beginnin...
How do I concatenate two strings in C?
...port for strings that some other languages have. A string in C is just a pointer to an array of char that is terminated by the first null character. There is no string concatenation operator in C.
Use strcat to concatenate two strings. You could use the following function to do it:
#include <st...
XML serialization in Java? [closed]
... If your classes evolve and you still need to deserialize old XML, you run into issues because both the documentation and the error messages are somewhat vague. Diagnosing the problem is usually doable, but figuring out how to fix it could take several days.
– toolforger
...
Where is Java's Array indexOf?
...om/javase/6/docs/api/java/util/… asList transforms the list of arguments into a list not the argument itself.
– Alexandru
Jun 28 '11 at 12:13
...
Any tools to generate an XSD schema from an XML instance document? [closed]
... cross platform (although Java is required)
From the Trang Website:
Trang converts between different schema languages for XML. It supports the following languages
RELAX NG (XML syntax)
RELAX NG compact syntax
XML 1.0 DTDs
W3C XML Schema
A schema written in any of the supported schema languages ca...
Like Operator in Entity Framework?
...patterns. Our current approach is similar to what you mentioned, we would convert those queries into operations using contains, indexof, startswith, endswith, etc. I was just hoping that there was a more general-purpose solution.
– brien
Jun 23 '09 at 14:50
...