base.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * All rights reserved.                                                      *
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 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
 *                                                                           *
 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_MESH_ELEMENTS_BASE_BASE_H
#define VCL_MESH_ELEMENTS_BASE_BASE_H
 
#include <vclib/base.h>
 
#include <string>
 
namespace vcl {
 
struct ElemId
{
    enum Enum : uint {
        VERTEX = 0,
        FACE,
        EDGE,
        ELEMENTS_NUMBER,
    };
};
 
constexpr const char* ELEMENT_ENUM_STRINGS[ElemId::ELEMENTS_NUMBER] = {
    "Vertex",
    "Face",
    "Edge",
};
 
template<uint ELEM_ID>
struct ElementString
{
    const char* str = ELEM_ID < ElemId::ELEMENTS_NUMBER ?
                          ELEMENT_ENUM_STRINGS[ELEM_ID] :
                          nullptr;
};
 
template<uint ELEM_ID>
constexpr const char* elementEnumCString()
{
    static_assert(
        ElementString<ELEM_ID>().str != nullptr,
        "Invalid ElementIDEnum. You should specialize 'the ElementString' "
        "struct with your ELEM_ID value.");
 
    return ElementString<ELEM_ID>().str;
}
 
// Todo: make this function constexpr when upgrading to C++23.
template<uint ELEM_ID>
const std::string& elementEnumString()
{
    static const std::string str = elementEnumCString<ELEM_ID>();
 
    return str;
}
 
} // namespace vcl
 
#endif // VCL_MESH_ELEMENTS_BASE_BASE_H