contains_type.h

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/*  Copyright (c) SILVERCODERS Ltd, http://silvercoders.com                                                                                  */
/*  Project homepage: https://github.com/docwire/docwire                                                                                     */
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/*  SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-DocWire-Commercial                                                                  */
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#ifndef DOCWIRE_CONTAINS_TYPE_H
#define DOCWIRE_CONTAINS_TYPE_H
 
#include "error.h"
#include <exception>
 
namespace docwire::errors
{
 
template <typename T>
bool contains_type(const std::exception& e)
{
    try
    {
        const errors::base& error = dynamic_cast<const errors::base&>(e);
        for (size_t i = 0; i < error.context_count(); ++i)
        {
            if (error.context_type(i) == typeid(T))
                return true;
        }
    }
    catch (const std::bad_cast&)
    {
        // e is not errors::base, but may still have nested exceptions
    }
 
    try
    {
        std::rethrow_if_nested(e);
    }
    catch (const std::exception& nested_ex)
    {
        return contains_type<T>(nested_ex);
    }
    catch (...) {}
 
    return false;
}
 
} // namespace docwire::errors
 
#endif // DOCWIRE_CONTAINS_TYPE_H