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OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
...libeasy的如下两个上层接口：
easy_session_t *easy_session_create(int64_t asize)
int easy_client_dispatch(easy_io_t *eio, easy_addr_t addr, easy_session_t *s)
首先看看session这个关键的数据结构：
#define EASY_MESSAGE_SESSION_HEADER \
easy_connection_t *c; \
e...
Jackson overcoming underscores in favor of camel-case
...
You can configure the ObjectMapper to convert camel case to names with an underscore:
objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
Or annotate a specific model class with this annotation:
@JsonNaming(PropertyNamingStrategy.SnakeC...
What happens to a declared, uninitialized variable in C? Does it have a value?
...Static variables (file scope and function static) are initialized to zero:
int x; // zero
int y = 0; // also zero
void foo() {
static int x; // also zero
}
Non-static variables (local variables) are indeterminate. Reading them prior to assigning a value results in undefined behavior.
void foo(...
How to sort in-place using the merge sort algorithm?
...g.
For example like the following merge function.
void wmerge(Key* xs, int i, int m, int j, int n, int w) {
while (i < m && j < n)
swap(xs, w++, xs[i] < xs[j] ? i++ : j++);
while (i < m)
swap(xs, w++, i++);
while (j < n)
swap(xs, w++, j+...
C# LINQ find duplicates in List
Using LINQ, from a List<int> , how can I retrieve a list that contains entries repeated more than once and their values?
...
Linux automake自动编译全攻略 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
代码如下：
lib目录下头文件calc.h：
#include <stdio.h>
int add(int a, int b);
lib目录函数实现calc.c：
#include "calc.h"
int add(int a, int b)
{
return a + b;
}
主目录下测试代码test.c：
#include <stdio.h>
#include "lib/calc.h"
int main(i...
Linux automake自动编译全攻略 - 脚本技术 - 清泛IT社区，为创新赋能！
...
代码如下：
lib目录下头文件calc.h：
#include <stdio.h>
int add(int a, int b);lib目录函数实现calc.c：
#include "calc.h"
int add(int a, int b)
{
return a + b;
}
主目录下测试代码test.c：
#include <stdio.h>
#inclu...
【解决】标准库std::min/std::max 与 Windows.h中的宏 min/max 冲突问题 - ...
...了Windows h的 C++ 源代码中使用std::min std::max会出现错误。int main(){ int x = std::max(0, 1); int y = std::min(-1, 0);}error C2589: & 在包含了 Windows.h 的 C++ 源代码中使用 std::min/std::max 会出现错误。
int main()
{
int x = std::max(0, 1);
int y...
Combine two ActiveRecord::Relation objects
...
Relation objects can be converted to arrays. This negates being able to use any ActiveRecord methods on them afterwards, but I didn't need to. I did this:
name_relation = first_name_relation + last_name_relation
Ruby 1.9, rails 3.2
...
Are Exceptions in C++ really slow
...
You can never claim about performance unless you convert the code to the assembly or benchmark it.
Here is what you see: (quick-bench)
The error code is not sensitive to the percentage of occurrence. Exceptions have a little bit overhead as long as they are never thrown. ...