IOrderValidator

IOrderValidator defines the interface for validating outbound orders before submission. It ensures correctness and compliance with predefined constraints (e.g. price ranges, order size).

class IOrderValidator : public ISubsystem {
public:
  virtual ~IOrderValidator() = default;
  virtual bool validate(const Order& order, std::string& reason) const = 0;
};

Purpose

• Prevent invalid or unsafe orders from reaching the execution layer by performing sanity checks.

Responsibilities

Method	Description
validate	Checks if the order is valid. Returns true if valid; else sets reason.

Notes

• Must be called prior to invoking IOrderExecutor::submitOrder().
• Provides human-readable error messages via the reason output parameter.

• Implementations can enforce checks such as:

• Non-zero quantity

• Price within expected deviation
• Tick-size alignment
• Symbol validity
• Integrated into the engine as an ISubsystem for lifecycle coordination.