아래 예는 Tree 라는 문자열이 라이브러리 A와 B 에 쓰여 컴파일 오류가 나는 상황, 가장 쉽게는 변수명을 바꾸면 되는데, 양이 많은 경우에는 난감할 따름.
이경우, namespace 가 엄청 유용하다.
(via You complete me :: namespace의 장점과 사용법)
구현은 간단합니다.
namespace로 정의할 것들을 블럭으로 묶으면 됩니다.
namespace A {
struct Tree {};
}
namespace B {
int Tree;
}
사용하는 측에서는 다음중 하나를 선택해 쓰면 됩니다.
1. using namespace A;
(의미 : 현재 소스 코드에 A사 라이브러리만 쓰이는경우, 이름충돌이 예상되지 않으므로, A에 있는 모든 이름들을 현재 소스의 범위내에 가져온다)
2. using A::Tree;
(의미 : 현재 소?코드에 A사와 B사의 라이브러리가 동시에 쓰이는데, 현재 블럭에서 사용할 Tree는 A사의 Tree 구조체이다)
3. B::Tree = 10;
(의미 : 현재 소스 코드에 A사와 B사의 라이브러리가 동시에 쓰이는데, 현재 블럭에서 두 회사의 라이브러리가 모두 섞여 쓰이므로 명시적으로 이름을 정해준다)
using
그리고, using 이라는 키워드가 사용되는데 이것에 대한 설명도 첨언,
원래 namespace를 계속 써줘야 하는데 특정 파일내에서는 무조건 A namespace를 사용한다던지, 주로 사용하는 namespace를 생략하고 싶다던지 하면 using을 잘 활용하면 된다.
(via [C++] namespace 사용법 :: 돼민이)
std는 namespace 이며 cout은 함수이다.
std::cout std::endl 매번 std::을 코딩하기 번거롭다.
이를 해결 하기 위해 using을 사용해 std::를 제거해 보자.
[사용법]
using std::cout;
using std::endl;
The easiest method for installing CircuitPython is through the UF2 bootloader. UF2 is a slick piece of code that runs on your microcontroller, and it allows the board to appear as a drive on your computer. From there, you can simply drag-and-drop the CircuitPython installer! We will need to take the following steps to install CircuitPython on a SAMD21 board:
Install Arduino and the appropriate board definition
Download the UF2 bootloader Arduino code for your board
A REPL (say it, “REP-UL”) is an interactive way to talk to your computer in Python. To make this work, the computer does four things:
Read the user input (your Python commands).
Evaluate your code (to work out what you mean).
Print any results (so you can see the computer’s response).
Loop back to step 1 (to continue the conversation).
Mu is a simple code editor that works with the Adafruit CircuitPython boards.
for the installation, please refer the Adafruit tutorial from https://learn.adafruit.com/welcome-to-circuitpython/installing-mu-editor
WIZnet's first IPv4 IPv6 dual stack products are all yours to test and play!🥳
Join WIZnet design contest to create any IoT project using W6100 related products and win $15,000!🤩
Contest Home
Link : https://maker.wiznet.io/contests/contest-in-progress/201905-iot-ioffload-contest/
For more details, also visit https://maker.wiznet.io/
Ladyada’s 10 Lessons for Building Open Culture Companies
You can be a good company and a good business.
Open source isn’t a business or a marketing strategy for us, it’s the DNA of our company, it’s part of what we do.
Metrics — if you’re not measuring things, you cannot improve them.
We have a weekly all-company meeting called “State of the Fruit.” Be transparent with all parts of your business, early and often.
Skills can be taught. Good people making good decisions should be the focus and what is celebrated.
Celebrate others. It’s not just about you and your products.
Traveling takes too much time. Use the power of the internet. Publish frequently, from videos to blog posts.
Say no to things. It’s not about what you can do, it’s more about what you will not do.
Get a good trademark lawyer. If you’re open source, you’re giving away everything but your name, it’s important to protect it.
You do not need a fancy office or building to do great work. Great work can happen anywhere, even in an apartment.
(via Limor Fried of Adafruit Industries: You Can't Outsource Knowledge (Podcast))
Today, she and her team work alongside machines like pick-and-places and reflow ovens, not outsourcing the company's top asset: knowledge. "When something's not working, I know instantly, not two or three weeks later. Being next to the machines, I can revise and adapt quickly."
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