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When would anyone use a union? Is it a remnant from the C-only days?
...lue;
float float_value;
double double_value;
void* ptr_value;
};
};
Then you would use it such as:
/* construct a new float variant instance */
void init_float(struct my_variant_t* v, float initial_value) {
v->type = VAR_FLOAT;
v->float_value = initial_va...
How can HTML5 “replace” Flash? [closed]
...me libraries that provide useful and unique functionality (e.g. binding to TCP sockets) and it has some extended syntax options (e.g. namespaces, libraries) I refute the notion that it it takes "50% less code" to implement real world functionality in ActionScript vs JavaScript - especially for games...
Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...ituations where wrap-around behavior is actually useful - for example with TCP sequence numbers or certain algorithms, such as hash calculation. It may also help in situations where it's necessary to detect overflow, since performing calculations and checking whether they overflowed is often easier ...
How come a non-const reference cannot bind to a temporary object?
...it empty, but deconstructible
}
data* pimpl; // you would use a smart ptr, of course
};
X x(getx()); // x will steal the rvalue's data, leaving the temporary object empty
share
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不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
第三种方法
利用linux的策略路由
网上查找的参考资料
http://www.cnblogs.com/gunl/archive/2010/09/14/1826234.html
知识准备
一、原理说明
1、路由表（table）从0到255进行编号，每个编号可以对应一个别名，编号和别名的对应关系在linux...
STL or Qt containers?
...on (Qt 2 had QList (pointer-based) and QValueList (value-based); Qt 3 had QPtrList and QValueList; Qt 4 now has QList, and it's nothing at all like QPtrList or QValueList).
Even if you end up using the Qt containers, use the STL-compatible API subset (ie. push_back(), not append(); front(), not firs...
When should I mock?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
How do I set a variable to the output of a command in Bash?
..., like user interaction.
This could be used with static files or even /dev/tcp/xx.xx.xx.xx/yyy with x for ip address or hostname and y for port number:
{
read -u $list -a head # read header in array `head`
varnames=(${head[@]//[K1% -]}) # drop illegal chars for variable names
wh...
What is std::promise?
...;int> pr2(std::move(pr));
pr2.set_exception(std::make_exception_ptr(std::runtime_error("Booboo")));
}
return fut.get();
}
// throws the runtime_error exception
Case 7: Broken promise
int test()
{
std::promise<int> pr;
auto fut = pr.get_future();
{
st...
Are Exceptions in C++ really slow
...ap::find should not throw but I am fine with map::find returning a checked_ptr which throws if an attempt to dereference it fails because it's null: in the latter case, as in the case of the class that Alexandrescu introduced, the caller chooses between explicit check and relying on exceptions. Empo...