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What is a “context bound” in Scala?
... to Scala 2.7, tabulate could be
written as follows:
def tabulate[T](len: Int, f: Int => T) = {
val xs = new Array[T](len)
for (i <- 0 until len) xs(i) = f(i)
xs
}
In Scala 2.8 this is no longer possible, because runtime information is necessary to create the right representatio...
Quicksort vs heapsort
...hough there remains
the chance of worst case performance
except in the introsort variant, which
switches to heapsort when a bad case
is detected. If it is known in advance
that heapsort is going to be
necessary, using it directly will be
faster than waiting for introsort to
switch to...
What is the fastest factorial function in JavaScript? [closed]
...000 will be truncated so if you're going to use this approach make sure to convert to exponential before using the aforementioned table.
– David Scott Kirby
May 2 '14 at 20:36
...
C++ Double Address Operator? (&&)
...
&& is new in C++11. int&& a means "a" is an r-value reference. && is normally only used to declare a parameter of a function. And it only takes a r-value expression. If you don't know what an r-value is, the simple explanation is...
How to rethrow the same exception in SQL Server
...nd try
begin catch
declare @ErrorMessage nvarchar(max), @ErrorSeverity int, @ErrorState int;
select @ErrorMessage = ERROR_MESSAGE() + ' Line ' + cast(ERROR_LINE() as nvarchar(5)), @ErrorSeverity = ERROR_SEVERITY(), @ErrorState = ERROR_STATE();
if @@trancount > 0 rollback transaction;
...
Altering a column to be nullable
...s):
ALTER TABLE Merchant_Pending_Functions ALTER COLUMN NumberOfLocations INT NULL
Replace INT with your actual datatype.
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How can I generate random number in specific range in Android? [duplicate]
...
Random r = new Random();
int i1 = r.nextInt(80 - 65) + 65;
This gives a random integer between 65 (inclusive) and 80 (exclusive), one of 65,66,...,78,79.
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C++11 tuple 这一篇就够了 - C/C++ - 清泛网 - 专注C/C++及内核技术
...法：
#include <iostream>
#include <tuple>
#include <functional>
int main()
{
auto t1 = std::make_tuple(10, "Test", 3.14);
std::cout << "The value of t1 is "
<< "(" << std::get<0>(t1) << ", " << std::get<1>(t1)
<< ", " << std::get<2>(t1) << ")\n";
...
CMap用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...高你的效率。CMap就是对Hash表的一种实现。先上实例：
int _tmain(int argc, char* argv[])
{
//定义
typedef CMap<int, int, CString, CString> CMapInt;
CMapInt map;
//添加key，val
map.SetAt(1, "str1");
map.SetAt(2, "str2");
map.SetAt(3, "str3");
map.SetAt...
c++ boost库 序列化与反序列化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...<typename Archive>void serialize(Archive& ar, TOrder & obj, const unsigned int ver...1、定义类/结构体序列化函数：
template <typename Archive>
void serialize(Archive& ar, TOrder & obj, const unsigned int version = SERIALIZATION_VERSION)
{
ar & BOOST_SERIALIZATION_NVP(obj.Pa...