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What does static_assert do, and what would you use it for?
...public:
static const int bar = 3;
};
static_assert(Foo::bar > 4, "Foo::bar is too small :(");
int main()
{
return Foo::bar;
}
$ g++ --std=c++0x a.cpp
a.cpp:7: error: static assertion failed: "Foo::bar is too small :("
...
可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术
...io库很多实现都以不可重入的方式使用全局数据结构。
(4) 进行了浮点运算.许多的处理器/编译器中，浮点一般都是不可重入的 (浮点运算大多使用协处理器或者软件模拟来实现。
关于信号处理程序中调用不可重入函数的例子...
Objective-C : BOOL vs bool
...
From the definition in objc.h:
#if (TARGET_OS_IPHONE && __LP64__) || TARGET_OS_WATCH
typedef bool BOOL;
#else
typedef signed char BOOL;
// BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C"
// even if -funsigned-char is used.
#endif
#define YES ((BOOL)1)
#define NO ...
Create or write/append in text file
...
348
Try something like this:
$txt = "user id date";
$myfile = file_put_contents('logs.txt', $tx...
'is' versus try cast with null check
...
149
Because there's only one cast. Compare this:
if (myObj.myProp is MyType) // cast #1
{
var ...
浅谈APM在电子交易系统中的应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...[3] 2015年开始，APM供应商推出的工具产品更加深入应用[4] ，包括基于用户相应时间的用户体验分析、业务交易分析、业务系统视图分析、故障定位分析等。
下一代APM
新一代APM：让整个IT团队参与应用性能监控。
好的APM可以...
How do I sort a vector of pairs based on the second element of the pair?
...
EDIT: using c++14, the best solution is very easy to write thanks to lambdas that can now have parameters of type auto. This is my current favorite solution
std::sort(v.begin(), v.end(), [](auto &left, auto &right) {
return left...
Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...封邮件发送给多少个收件人，该参数的缺省值为1000。
4． 推迟投递控制
通过defer_transports参数，我们可以推迟投递该参数指定的邮件直到postfix明确的提出投递要求。下面我们看一个例子：
有一个小型的局域网，用户都将邮...
How to install XNA game studio on Visual Studio 2012?
...
4 Answers
4
Active
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How to get method parameter names?
...s variables, and the defaults provided. ie.
>>> def foo(a, b, c=4, *arglist, **keywords): pass
>>> inspect.getfullargspec(foo)
(['a', 'b', 'c'], 'arglist', 'keywords', (4,))
Note that some callables may not be introspectable in certain implementations of Python. For Example, in...