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Are members of a C++ struct initialized to 0 by default?
...hot s; // receives no initialization
Snapshot s = {}; // value initializes all members
The second will make all members zero, the first leaves them at unspecified values. Note that it is recursive:
struct Parent { Snapshot s; };
Parent p; // receives no initialization
Parent p = {}; // value init...
How do I reverse a C++ vector?
...
All containers offer a reversed view of their content with rbegin() and rend(). These two functions return so-calles reverse iterators, which can be used like normal ones, but it will look like the container is actually rever...
Why does dividing two int not yield the right value when assigned to double?
... to explicitly convert both a and b to double simply for clarity, but it really doesn't matter.
– John Dibling
Sep 27 '11 at 15:31
...
Is C++ context-free or context-sensitive?
... is (probably) Turing-complete, since it shows a program which is syntactically correct if and only if a given integer is prime.
So I assert that C++ is neither context-free nor context-sensitive.
If you allow arbitrary symbol sequences on both sides of any production, you produce an Type-0 gramma...
What are the default access modifiers in C#?
...}
The one sort of exception to this is making one part of a property (usually the setter) more restricted than the declared accessibility of the property itself:
public string Name
{
get { ... }
private set { ... } // This isn't the default, have to do it explicitly
}
This is what the...
如何编写一个独立的 PHP 扩展（译） - 更多技术 - 清泛网 - 专注C/C++及内核技术
... PHP 源码。
定义一个新扩展
我们给示例扩展命名为 “foobar”。
新扩展包含两个资源文件：foo.c 和 bar.c（还有一些头文件，但这些不只重要）。
示例扩展不引用任何外部的库（这点很重要，因为这样用户就不需要特别指定一...
Why don't structs support inheritance?
...without any knowledge that a derived type is being used.)
So, if this actually happened, we'd have memory corruption issues. Specifically, within Square(), values[1].A*=2 would actually be modifying values[0].B!
Try to debug THAT!
...
Why should I use Hamcrest-Matcher and assertThat() instead of traditional assertXXX()-Methods
...ed) state four advantages :
More readable and typeable: this syntax allows you to think in terms of subject, verb, object (assert "x is 3") rather than assertEquals, which uses verb, object, subject (assert "equals 3 x")
Combinations: any matcher statement s can be negated (not(s)), combine...
Remove blank lines with grep
...
Try the following:
grep -v -e '^$' foo.txt
The -e option allows regex patterns for matching.
The single quotes around ^$ makes it work for Cshell. Other shells will be happy with either single or double quotes.
UPDATE: This works for me for a file with blank lines or "all white ...
How do I replace the *first instance* of a string in .NET?
...ample:
using System.Text.RegularExpressions;
...
Regex regex = new Regex("foo");
string result = regex.Replace("foo1 foo2 foo3 foo4", "bar", 1);
// result = "bar1 foo2 foo3 foo4"
The third parameter, set to 1 in this case, is the number of occurrences of the regex pattern that you wa...