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12 changes: 7 additions & 5 deletions include/CXXGraph/Utility/id_t.hpp
Original file line number Diff line number Diff line change
@@ -1,17 +1,19 @@
#pragma once

#ifdef CXXGRAPH_ID_TYPE
#include <type_traits>

#define IS_UNSIGNED(T) !(((T) - 1) < 0)
#else
#include <cstddef>
#endif

namespace CXXGraph {
#ifdef CXXGRAPH_ID_TYPE
// Throw compiler error if the type is signed
static_assert(IS_UNSIGNED(CXXGRAPH_ID_TYPE),
static_assert(std::is_unsigned_v<CXXGRAPH_ID_TYPE>,
"CXXGRAPH_ID_TYPE must be unsigned");

typedef CXXGRAPH_ID_TYPE id_t;
using id_t = CXXGRAPH_ID_TYPE;
#else
typedef std::size_t id_t;
using id_t = std::size_t;
#endif
} // namespace CXXGraph
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