LambdaValidator.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2023 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
#include "MantidKernel/TypedValidator.h"
#include "MantidKernel/WarningSuppressions.h"
#include <functional>
 
namespace Mantid::Kernel {
 
template <typename ParamType> class LambdaValidator : public TypedValidator<ParamType> {
  using ValidatorFunction = std::function<std::string(ParamType)>;
 
public:
  LambdaValidator()
      : m_validatorFunction([](GNU_UNUSED ParamType x) { return "Error: validator function is not initialized"; }) {}
  LambdaValidator(const ValidatorFunction &validatorFunction) : m_validatorFunction(validatorFunction) {};
 
  IValidator_sptr clone() const override { return std::make_shared<LambdaValidator>(*this); }
 
  void setValidatorFunction(const ValidatorFunction &validatorFunction) { m_validatorFunction = validatorFunction; };
 
private:
  std::string checkValidity(const ParamType &value) const override { return m_validatorFunction(value); }
 
  ValidatorFunction m_validatorFunction;
};
 
// namespace Kernel
 
} // namespace Mantid::Kernel