up tips

up tips

Update

Add some learning links

Add cppcon links

Add tips: convert double/float to string without trailing zeros

sizeof(class) or sizeof(class::instance)

sizeof a class instance

Using sed replace sinaimg prefix

Update {lower,upper}_bound implementation using binary_search

lower_bound, upper_bound in c++

Add notes about this pointer in class

reverse_iterator & string operation

Add how to iterate a map, how to delete while iteration

Update chapter11 TOC