大约有 12,000 项符合查询结果（耗时：0.0311秒） [XML]
Can I list-initialize a vector of move-only type?
...riadic arguments:
#include <vector>
#include <memory>
struct Foo
{
std::unique_ptr<int> u;
int x;
Foo(int x = 0): x(x) {}
};
template<typename V> // recursion-ender
void multi_emplace(std::vector<V> &vec) {}
template<typename V, typename T1...
How to check if object property exists with a variable holding the property name?
...is defined in the prototype chain (which is not the case here), like
var foo = {
hasOwnProperty: function() {
return false;
},
bar: 'Here be dragons'
};
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty
To inc...
Convert string to nullable type (int, double, etc…)
... return null;
}
Then call it like this...
void doStuff()
{
string foo = "1.0";
double? myDouble = foo.ToNullablePrimitive<double>(double.TryParse);
foo = "1";
int? myInt = foo.ToNullablePrimitive<int>(int.TryParse);
foo = "haha";
int? myInt2 = foo.ToNull...
How can I create an object based on an interface file definition in TypeScript?
...odal>{}. It removes an ambiguity in the language grammar when using <foo> style assertions in JSX. Read more. And of course, use let or const instead of var.
– Alex Klaus
Oct 2 '18 at 7:55
...
Remove json element
...
var json = { ... };
var key = "foo";
delete json[key]; // Removes json.foo from the dictionary.
You can use splice to remove elements from an array.
share
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...
How can I ssh directly to a particular directory?
... You'll usually want a login shell: ssh -t example.com "cd /foo/bar; exec \$SHELL -l"
– christianbundy
Apr 28 '14 at 3:54
...
When to use the brace-enclosed initializer?
...t works everywhere, for instance even for in-class initialization:
struct foo {
// Ok
std::string a = { "foo" };
// Also ok
std::string b { "bar" };
// Not possible
std::string c("qux");
// For completeness this is possible
std::string d = "baz";
};
or for funct...
What is “thread local storage” in Python, and why do I need it?
...ocal
data = local()
def bar():
print("I'm called from", data.v)
def foo():
bar()
class T(Thread):
def run(self):
sleep(random())
data.v = self.getName() # Thread-1 and Thread-2 accordingly
sleep(1)
foo()
>> T().start(); T().start()
I'm calle...
When to use “new” and when not to, in C++? [duplicate]
...l be destroyed when it goes out of scope. Some examples of this are:
void foo()
{
Point p = Point(0,0);
} // p is now destroyed.
for (...)
{
Point p = Point(0,0);
} // p is destroyed after each loop
Some people will say that the use of new decides whether your object is on the heap or the st...
What's the strangest corner case you've seen in C# or .NET? [closed]
...e original code was obviously more complex and subtle...)
static void Foo<T>() where T : new()
{
T t = new T();
Console.WriteLine(t.ToString()); // works fine
Console.WriteLine(t.GetHashCode()); // works fine
Console.WriteLine(t.Equals(t)); // works fin...