b = a，返回引用； c = a + b，返回值；return int(a+c) 创建一个临时对象并返回

临时对象直接在外部储存单元中创建并初始化。

office building optimization

1. find the best design process for office building design using GP.
   Genome:  a b a a a b
   gene:        a
   gene-metadata: 12345 -> a -> a b a a a b
   gene-metadata: 12344 -> a -> a b a a a b 
   gene-metadata: 21340 -> b -> b b a a a b

2. object-oriented crossover and mutation

c#/csharp "@" at-sign

int new = 123;  // 'new' is a keyword 
int @new = 123; // no error 
 
string str1 = "photos\\aug";
string str2 = @"photos\aug";

c++ managed unmanaged 托管，非托管 .net