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sqlite 命令行创建一个空库 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...的SQLite数据库的优势，比touch创建一个空文件好。$sqlite3 foo db "create table t(f int); drop table t;"可以通过以下方 SQLite创建一个空白的数据库，具有被识别为有效的SQLite数据库的优势，比touch创建一个空文件好。
$sqlite3 foo.db "create t...
How to automatically convert strongly typed enum into int?
...typename std::underlying_type<E>::type>(e);
}
std::cout << foo(to_underlying(b::B2)) << std::endl;
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What do
...rther constrain one of its type parameters. Here's an example:
case class Foo[A](a:A) { // 'A' can be substituted with any type
// getStringLength can only be used if this is a Foo[String]
def getStringLength(implicit evidence: A =:= String) = a.length
}
The implicit argument evidence is ...
Java: splitting a comma-separated string but ignoring commas in quotes
...ain {
public static void main(String[] args) {
String line = "foo,bar,c;qual=\"baz,blurb\",d;junk=\"quux,syzygy\"";
String[] tokens = line.split(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)", -1);
for(String t : tokens) {
System.out.println("> "+t);
}
}
...
Return two and more values from a method
... an implicit return by explicitly putting the return values in a list: def foo_and_bar; ['foo', 'bar']; end
– Dennis
Dec 9 '14 at 13:06
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.gitignore exclude folder but include specific subfolder
...tant!.txt".
Example to exclude everything except a specific directory foo/bar (note the /* - without the slash, the wildcard would also exclude everything within foo/bar):
--------------------------------------------------------------
$ cat .gitignore
# exclude everything except di...
How can I add a custom HTTP header to ajax request with js or jQuery?
...dd the headers property:
// Request with custom header
$.ajax({
url: 'foo/bar',
headers: { 'x-my-custom-header': 'some value' }
});
If you want to add a default header (or set of headers) to every request then use $.ajaxSetup():
$.ajaxSetup({
headers: { 'x-my-custom-header': 'some va...
Can I initialize a C# attribute with an array or other variable number of arguments?
... do it, but it isn't CLS compliant:
[assembly: CLSCompliant(true)]
class Foo : Attribute
{
public Foo(string[] vals) { }
}
[Foo(new string[] {"abc","def"})]
static void Bar() {}
Shows:
Warning 1 Arrays as attribute arguments is not CLS-compliant
For regular reflection usage, it may be p...
Staging Deleted files
Say I have a file in my git repository called foo .
9 Answers
9
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What's wrong with overridable method calls in constructors?
...
public class Main {
static abstract class A {
abstract void foo();
A() {
System.out.println("Constructing A");
foo();
}
}
static class C extends A {
C() {
System.out.println("Constructing C");
}
void...