Swap a Strategy at Runtime

Difficulty

Asked at Da Vinci Derivatives

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Available in Python and C++. You are solving it in Python. Switch to C++

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Language:

Python 3.12 C++23

Engine

from typing import Any


class FlatSizer:
    """..."""

    def __init__(self, lots: int) -> None:
        self.lots = lots

    def size(self, signal: int) -> int:
        # ...
        pass


class ProportionalSizer:
    """..."""

    def __init__(self, scale: int) -> None:
        self.scale = scale

    def size(self, signal: int) -> int:
        # ...
        pass


class CappedSizer:
    """..."""

    def __init__(self, scale: int, limit: int) -> None:
        # ...
        pass

    def size(self, signal: int) -> int:
        # ...
        pass


class Engine:
    """..."""

    def __init__(self, sizer: Any) -> None:
        # ...
        pass

    def set_sizer(self, sizer: Any) -> None:
        # ...
        pass

    def place(self, signal: int) -> int:
        # ...
        pass

    def history(self) -> list[tuple[int, int]]:
        # ...
        pass

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Swap a Strategy at Runtime

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