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What's the (hidden) cost of Scala's lazy val?
One handy feature of Scala is lazy val , where the evaluation of a val is delayed until it's necessary (at first access).
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How do I find out if the GPS of an Android device is enabled
On an Android Cupcake (1.5) enabled device, how do I check and activate the GPS?
10 Answers
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Why does C++ not allow inherited friendship?
Why is friendship not at least optionally inheritable in C++? I understand transitivity and reflexivity being forbidden for obvious reasons (I say this only to head off simple FAQ quote answers), but the lack of something along the lines of virtual friend class Foo; puzzles me. Does anyone know ...
STL：accumulate与自定义数据类型 - C/C++ - 清泛网 - 专注C/C++及内核技术
...算数组或者容器中C++内置数据类型，例如：#include <numeric>int...C++ STL中有一个通用的数值类型计算函数— accumulate(),可以用来直接计算数组或者容器中C++内置数据类型，例如：
#include <numeric>
int arr[]={10,20,30,40,50};
vector<int> va(&arr...
shared_ptr指针被赋值后，原指针会引用清零、自动释放。 - C/C++ - 清泛网 ...
...被赋值后，原指针会引用清零、自动释放。std::shared_ptr<int> intg;void foo(std::shared_ptr<int> p){ ...shared_ptr指针被赋值后，原指针会引用清零、自动释放。
std::shared_ptr<int> intg;
void foo(std::shared_ptr<int> p)
{
intg = p; // 原指...
jsoncpp 不能处理__int64(long long)类型数据 - C/C++ - 清泛网 - 专注C/C++及内核技术
jsoncpp 不能处理__int64(long long)类型数据jsoncpp，是一个c++的解析和生成json的开源工具。如果你的c++程序需要解析或生成json，它会使这个过程变得很简单！但是，今天在用jsoncpp进...jsoncpp，是一个c++的解析和生成json的开源工具。如...
Getting result of dynamic SQL into a variable for sql-server
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DECLARE @sqlCommand nvarchar(1000)
DECLARE @city varchar(75)
declare @counts int
SET @city = 'New York'
SET @sqlCommand = 'SELECT @cnt=COUNT(*) FROM customers WHERE City = @city'
EXECUTE sp_executesql @sqlCommand, N'@city nvarchar(75),@cnt i...
Java: How to test methods that call System.exit()?
...n normal use it will drift all the way out to the JVM's last-ditch catcher and shut your script down (unless you decide to catch it somewhere along the way, which might be useful someday).
In the JUnit scenario it will be caught by the JUnit framework, which will report that
such-and-such te...
Post-increment and pre-increment within a 'for' loop produce same output [duplicate]
...ng for loops produce identical results even though one uses post increment and the other pre-increment.
12 Answers
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How do I time a method's execution in Java?
...l Duration.between(start, end).getSeconds(). Duration also has methods to convert to other time units, e.g. toMillis() which converts to milliseconds.
– Emil Lunde
May 29 '18 at 13:29
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