skydoor questions

• How to group the records according to the range in SQL
• why are concrete types rarely useful as bases for further derivation
• How to get the printed information of a command in Shell Script
• The method used in 3rd-party garbage collector
• question about STL thread-safe and STL debugging
• pass static variable between two files in C/C++
• failed constructor and failed destructor in C++
• difference between two ways to insert into map
• How to get the size of an object via reference?
• How to call execute command line in C++

skydoor answers