...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
value_type
Template version:
typedef T value_type;
Float specialization version:
typedef float value_type;
Double specialization version:
typedef double value_type;
Long double specialization version:
typedef long double value_type;
These provide easy access to the type the template is built upon.