I will not be lazy from now...

 The height of mountain of Baek-Du is 2770m. It can also be 2.77km. It is depending on the unit you want to use. The fact is, whatever you use 2770 or 2.77, both means Baek-Du's height, whatever you

Pattern inline auto var = [value]; Description C++ consist a lot of source files. They are compiled, linked into single binary file. When linking, it occurs error when you defined some symbols multiple

Pattern if constexpr(condition){ /* do something */ } else ifconstexpr(condition){ /* do something */ } Description constexpr-if looks very similar to if-else. The difference is that constexpr-if's condition

Pattern if(auto var(...); condition) /* do something */; switch(auto var(...); var) {/* do something */} Description When we want to find a key in std::map, we have to make iterator to store result of

Pattern auto [var1, var2, ...] = <pair, tuple, struct, or array expression>; Descripton Before C++15, when we have to get some values from certain struct, we have to make struct instance and get

I will post something about programming what I learned. I'm not a pro, not even English speaker. My writing quality would be poor. But I will try my best.