LitteralExpressionImpl.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
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/* LitteralExpressionImpl.h                                    (C) 2000-2025 */
/*                                                                           */
/* Implementation of a literal expression containing a scalar.               */
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#ifndef ARCANE_CORE_EXPR_LITTERALEXPRESSIONIMPL_H
#define ARCANE_CORE_EXPR_LITTERALEXPRESSIONIMPL_H
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#include "arcane/core/datatype/ScalarVariant.h"
 
#include "arcane/expr/ExpressionImpl.h"
#include "arcane/expr/Expression.h"
#include "arcane/expr/ExpressionResult.h"
 
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namespace Arcane
{
 
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class LitteralOperator;
 
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class LitteralExpressionImpl
: public ExpressionImpl
{
 public:
 
  explicit LitteralExpressionImpl(const ScalarVariant& value);
 
 public:
 
  virtual void assign(IExpressionImpl*) {}
  virtual void assign(IExpressionImpl*, IntegerConstArrayView) {}
  virtual void apply(ExpressionResult* result);
  virtual Integer vectorSize() const { return 0; }
 
 private:
 
  ScalarVariant m_value;
};
 
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class LitteralOperator
{
 public:
 
  virtual ~LitteralOperator() {}
 
 public:
 
  virtual void evaluate(ExpressionResult* res, ScalarVariant& a) = 0;
};
 
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/*---------------------------------------------------------------------------*/
 
template <typename T>
class LitteralOperatorT
: public LitteralOperator
{
 public:
 
  void evaluate(ExpressionResult* res, ScalarVariant& a) override
  {
    // Allocate the result based on the variant type
    res->allocate(a.type());
 
    // Retrieve the operand values
    ArrayView<T> res_val;
    res->data()->value(res_val);
    T a_val;
    a.value(a_val);
 
    Integer size = res->data()->size();
    for (Integer i = 0; i < size; ++i)
      res_val[i] = a_val;
  }
};
 
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} // End namespace Arcane
 
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#endif