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What does “dereferencing” a pointer mean?
...ring to the second byte in the process's memory, 2 the third, 3 the fourth and so on....
What happened to 0 and the first byte? Well, we'll get to that later - see null pointers below.
For a more accurate definition of what pointers store, and how memory and addresses relate, see "More about memo...
Is it possible to print a variable's type in standard C++?
... update to a very old question: Print variable type in C++.
The accepted (and good) answer is to use typeid(a).name(), where a is a variable name.
Now in C++11 we have decltype(x), which can turn an expression into a type. And decltype() comes with its own set of very interesting rules. For exam...
shared_ptr to an array : should it be used?
...r delete p, when T is not an array type, shall have well-defined behavior, and shall not throw exceptions.
...
Remarks: When T is an array type, this constructor shall not participate in overload resolution unless the expression delete[] p is well-formed and either T is U[N] and Y(*)[N] is conve...
Cleaner way to do a null check in C#? [duplicate]
...
In a generic way, you may use an expression tree and check with an extension method:
if (!person.IsNull(p => p.contact.address.city))
{
//Nothing is null
}
Full code:
public class IsNullVisitor : ExpressionVisitor
{
public bool IsNull { get; private set; }
...
What is the most elegant way to remove a path from the $PATH variable in Bash?
... @Martin: POSIX does not require this behavior, but does document and allow it: pubs.opengroup.org/onlinepubs/9699919799/basedefs/…
– Fred Foo
Mar 13 '11 at 23:04
1
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Use LINQ to get items in one List, that are not in another List
...p2.ID != p.ID));
Warning: As noted in the comments, these approaches mandate an O(n*m) operation. That may be fine, but could introduce performance issues, and especially if the data set is quite large. If this doesn't satisfy your performance requirements, you may need to evaluate other option...
Optimal way to concatenate/aggregate strings
...on to facilitate this would be nice. I've tried solutions using COALESCE and FOR XML , but they just don't cut it for me.
...
%d,%c,%s,%x等转换符 释义 - C/C++ - 清泛IT论坛，有思想、有深度
转换说明符
%a(%A) 浮点数、十六进制数字和p-(P-)记数法(C99)
%c 字符
%d 有符号十进制整数
%f 浮点数(包括float和doulbe)
%e(%E) 浮点数指数输出[e-(E-)记数法]
%g(%G) 浮点...
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...
shared_ptr指针被赋值后，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
        //*(in...
Combining two expressions (Expression)
I have two expressions of type Expression<Func<T, bool>> and I want to take to OR, AND or NOT of these and get a new expression of the same type
...