diff --git a/include/boost/range/iterator_range_core.hpp b/include/boost/range/iterator_range_core.hpp
index cefabd4..08e5b73 100644
a
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b
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protected:
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336 | 336 | public: |
337 | 337 | reference operator[](difference_type at) const |
338 | 338 | { |
339 | | BOOST_ASSERT(at >= 0 && at < size()); |
| 339 | BOOST_ASSERT(at >= 0 && ((size_type)at) < size()); |
340 | 340 | return this->m_Begin[at]; |
341 | 341 | } |
342 | 342 | |
… |
… |
public:
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347 | 347 | // |
348 | 348 | abstract_value_type operator()(difference_type at) const |
349 | 349 | { |
350 | | BOOST_ASSERT(at >= 0 && at < size()); |
| 350 | BOOST_ASSERT(at >= 0 && ((size_type)at) < size()); |
351 | 351 | return this->m_Begin[at]; |
352 | 352 | } |
353 | 353 | |