C++14 user-defined literal

In C++14 some suffixes were added to specify the type of some user-define literals.Some of them are shown below.

The suffix ‘s‘ is added in string literal to signify it as a string type.Consider the code below.

auto s=”Happy new year!” ; //s is ‘const char*’ type

auto st=”Happy”s ; //st is ‘string’ type

auto str=”new” , str1= “addition”s  ; //error!

The third line will give you an error since str will be deduced as ‘const char*’, but str1 will be deduced as ‘string’ type. Note the difference here.

The suffixes ‘h‘, ‘min‘, ‘s‘, ‘ms‘, ‘us‘, ‘ns‘ is used to denote various chrono::duration time intervals.

auto sec=60s ; //s is chrono::seconds type

auto hr=2h ; //hr is chrono::hours type

auto mls=56ms ; //mls is chrono:milli-seconds

For complex class there are some suffixes which specify the literals as complex<float> , complex<double> and complex<long double>. The suffixes are given below.
 
‘if‘, ‘i‘, ‘il‘.

auto comd=345i ;  //comd is complex<double> type

auto comld=234il ;  //comld is complex<long double> type