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fixes vtable documentation in tut2 (#24304)

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ref https://forum.nim-lang.org/t/12537#77311
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ringabout
2025-10-15 14:22:27 +08:00
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parent f191ba8ddd
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doc/tut2.md
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@@ -347,10 +347,12 @@ As the example demonstrates, invocation of a multi-method cannot be ambiguous:
Collide 2 is preferred over collide 1 because the resolution works from left to
right. Thus `Unit, Thing` is preferred over `Thing, Unit`.
**Performance note**: Nim does not produce a virtual method table, but
generates dispatch trees. This avoids the expensive indirect branch for method
calls and enables inlining. However, other optimizations like compile time
evaluation or dead code elimination do not work with methods.
**Performance note**: Nim generates dispatch trees for methods by default.
With `--experimental:vtables`, it also provides an option to generate
a virtual method table for methods,
which tends to produce better performance in general,
especially for deep object hierarchies.
However, other optimizations like compile time evaluation or dead code elimination do not work with methods.
Exceptions