src/apps/testapps/testPolygonToCellsExperimental.c [81:92]:
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static bool isTransmeridianCell(H3Index h) {
    CellBoundary bndry;
    H3_EXPORT(cellToBoundary)(h, &bndry);

    double minLng = M_PI, maxLng = -M_PI;
    for (int i = 0; i < bndry.numVerts; i++) {
        if (bndry.verts[i].lng < minLng) minLng = bndry.verts[i].lng;
        if (bndry.verts[i].lng > maxLng) maxLng = bndry.verts[i].lng;
    }

    return maxLng - minLng > M_PI - (M_PI / 4);
}
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src/apps/testapps/testPolygonToCells.c [68:79]:
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static bool isTransmeridianCell(H3Index h) {
    CellBoundary bndry;
    H3_EXPORT(cellToBoundary)(h, &bndry);

    double minLng = M_PI, maxLng = -M_PI;
    for (int i = 0; i < bndry.numVerts; i++) {
        if (bndry.verts[i].lng < minLng) minLng = bndry.verts[i].lng;
        if (bndry.verts[i].lng > maxLng) maxLng = bndry.verts[i].lng;
    }

    return maxLng - minLng > M_PI - (M_PI / 4);
}
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