SBT MS

SBT MS typically refers to Microsoft's implementation of Structured Binding Trees (SBT). Structured Binding Trees are a data structure and mechanism employed by the Microsoft C++ compiler (MSVC) to optimize the compilation and execution of code that utilizes structured bindings, a C++17 feature.

Structured bindings provide a convenient way to unpack elements from tuples, structs, pairs, and arrays into named variables. The compiler, instead of directly copying or moving the values, can leverage SBT to create a tree-like representation of the binding structure. This allows for optimizations such as:

• Lifetime Extension: The lifetimes of bound objects can be extended appropriately to match the lifetime of the structured binding itself.

• Avoiding Unnecessary Copies/Moves: The compiler can directly access the underlying storage of the original object without creating intermediate copies or moves. In scenarios where the bound variables are references, the references can directly bind to the original elements.

• Alias Analysis: SBT aids in analyzing the relationships between the bound variables and the original object, enabling further optimizations like inlining and common subexpression elimination.

The SBT MS implementation is a key component in enabling efficient use of structured bindings within the MSVC compiler. It allows developers to leverage the readability and convenience of structured bindings without significant performance overhead. The specifics of the SBT MS representation and optimization techniques are proprietary to Microsoft.