diff --git a/include/gsl/gsl_byte b/include/gsl/gsl_byte
index 6e34a55..5da9a86 100644
--- a/include/gsl/gsl_byte
+++ b/include/gsl/gsl_byte
@@ -74,63 +74,63 @@ enum class byte : unsigned char
 };
 
 template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
-inline constexpr byte& operator<<=(byte& b, IntegerType shift) noexcept
+constexpr byte& operator<<=(byte& b, IntegerType shift) noexcept
 {
     return b = byte(static_cast<unsigned char>(b) << shift);
 }
 
 template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
-inline constexpr byte operator<<(byte b, IntegerType shift) noexcept
+constexpr byte operator<<(byte b, IntegerType shift) noexcept
 {
     return byte(static_cast<unsigned char>(b) << shift);
 }
 
 template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
-inline constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept
+constexpr byte& operator>>=(byte& b, IntegerType shift) noexcept
 {
     return b = byte(static_cast<unsigned char>(b) >> shift);
 }
 
 template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
-inline constexpr byte operator>>(byte b, IntegerType shift) noexcept
+constexpr byte operator>>(byte b, IntegerType shift) noexcept
 {
     return byte(static_cast<unsigned char>(b) >> shift);
 }
 
-inline constexpr byte& operator|=(byte& l, byte r) noexcept
+constexpr byte& operator|=(byte& l, byte r) noexcept
 {
     return l = byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
 }
 
-inline constexpr byte operator|(byte l, byte r) noexcept
+constexpr byte operator|(byte l, byte r) noexcept
 {
     return byte(static_cast<unsigned char>(l) | static_cast<unsigned char>(r));
 }
 
-inline constexpr byte& operator&=(byte& l, byte r) noexcept
+constexpr byte& operator&=(byte& l, byte r) noexcept
 {
     return l = byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
 }
 
-inline constexpr byte operator&(byte l, byte r) noexcept
+constexpr byte operator&(byte l, byte r) noexcept
 {
     return byte(static_cast<unsigned char>(l) & static_cast<unsigned char>(r));
 }
 
-inline constexpr byte& operator^=(byte& l, byte r) noexcept
+constexpr byte& operator^=(byte& l, byte r) noexcept
 {
     return l = byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
 }
 
-inline constexpr byte operator^(byte l, byte r) noexcept
+constexpr byte operator^(byte l, byte r) noexcept
 {
     return byte(static_cast<unsigned char>(l) ^ static_cast<unsigned char>(r));
 }
 
-inline constexpr byte operator~(byte b) noexcept { return byte(~static_cast<unsigned char>(b)); }
+constexpr byte operator~(byte b) noexcept { return byte(~static_cast<unsigned char>(b)); }
 
 template <class IntegerType, class = std::enable_if_t<std::is_integral<IntegerType>::value>>
-inline constexpr IntegerType to_integer(byte b) noexcept
+constexpr IntegerType to_integer(byte b) noexcept
 {
     return static_cast<IntegerType>(b);
 }
@@ -138,7 +138,7 @@ inline constexpr IntegerType to_integer(byte b) noexcept
 #endif // GSL_USE_STD_BYTE
 
 template <bool E, typename T>
-inline constexpr byte to_byte_impl(T t) noexcept
+constexpr byte to_byte_impl(T t) noexcept
 {
     static_assert(
         E, "gsl::to_byte(t) must be provided an unsigned char, otherwise data loss may occur. "
@@ -146,19 +146,19 @@ inline constexpr byte to_byte_impl(T t) noexcept
     return static_cast<byte>(t);
 }
 template <>
-inline constexpr byte to_byte_impl<true, unsigned char>(unsigned char t) noexcept
+constexpr byte to_byte_impl<true, unsigned char>(unsigned char t) noexcept
 {
     return byte(t);
 }
 
 template <typename T>
-inline constexpr byte to_byte(T t) noexcept
+constexpr byte to_byte(T t) noexcept
 {
     return to_byte_impl<std::is_same<T, unsigned char>::value, T>(t);
 }
 
 template <int I>
-inline constexpr byte to_byte() noexcept
+constexpr byte to_byte() noexcept
 {
     static_assert(I >= 0 && I <= 255,
                   "gsl::byte only has 8 bits of storage, values must be in range 0-255");
diff --git a/include/gsl/gsl_util b/include/gsl/gsl_util
index eee63e7..b048a43 100644
--- a/include/gsl/gsl_util
+++ b/include/gsl/gsl_util
@@ -70,20 +70,21 @@ private:
 
 // finally() - convenience function to generate a final_action
 template <class F>
-inline final_action<F> finally(const F& f) noexcept
+
+final_action<F> finally(const F& f) noexcept
 {
     return final_action<F>(f);
 }
 
 template <class F>
-inline final_action<F> finally(F&& f) noexcept
+final_action<F> finally(F&& f) noexcept
 {
     return final_action<F>(std::forward<F>(f));
 }
 
 // narrow_cast(): a searchable way to do narrowing casts of values
 template <class T, class U>
-inline constexpr T narrow_cast(U&& u) noexcept
+constexpr T narrow_cast(U&& u) noexcept
 {
     return static_cast<T>(std::forward<U>(u));
 }
@@ -103,7 +104,7 @@ namespace details
 
 // narrow() : a checked version of narrow_cast() that throws if the cast changed the value
 template <class T, class U>
-inline T narrow(U u)
+T narrow(U u)
 {
     T t = narrow_cast<T>(u);
     if (static_cast<U>(t) != u) throw narrowing_error();
@@ -116,14 +117,14 @@ inline T narrow(U u)
 // at() - Bounds-checked way of accessing builtin arrays, std::array, std::vector
 //
 template <class T, std::size_t N>
-inline constexpr T& at(T (&arr)[N], const std::ptrdiff_t index)
+constexpr T& at(T (&arr)[N], const std::ptrdiff_t index)
 {
     Expects(index >= 0 && index < narrow_cast<std::ptrdiff_t>(N));
     return arr[static_cast<std::size_t>(index)];
 }
 
 template <class Cont>
-inline constexpr auto at(Cont& cont, const std::ptrdiff_t index) -> decltype(cont[cont.size()])
+constexpr auto at(Cont& cont, const std::ptrdiff_t index) -> decltype(cont[cont.size()])
 {
     Expects(index >= 0 && index < narrow_cast<std::ptrdiff_t>(cont.size()));
     using size_type = decltype(cont.size());
@@ -131,7 +132,7 @@ inline constexpr auto at(Cont& cont, const std::ptrdiff_t index) -> decltype(con
 }
 
 template <class T>
-inline constexpr T at(const std::initializer_list<T> cont, const std::ptrdiff_t index)
+constexpr T at(const std::initializer_list<T> cont, const std::ptrdiff_t index)
 {
     Expects(index >= 0 && index < narrow_cast<std::ptrdiff_t>(cont.size()));
     return *(cont.begin() + index);
diff --git a/include/gsl/multi_span b/include/gsl/multi_span
index 9dce739..cf82144 100644
--- a/include/gsl/multi_span
+++ b/include/gsl/multi_span
@@ -498,7 +498,7 @@ namespace details
 
     template <std::size_t Rank, bool Enabled = (Rank > 1),
               typename Ret = std::enable_if_t<Enabled, index<Rank - 1>>>
-    inline constexpr Ret shift_left(const index<Rank>& other) GSL_NOEXCEPT
+    constexpr Ret shift_left(const index<Rank>& other) GSL_NOEXCEPT
     {
         Ret ret{};
         for (std::size_t i = 0; i < Rank - 1; ++i) {
@@ -996,7 +996,7 @@ bounds_iterator<IndexType> operator+(typename bounds_iterator<IndexType>::differ
 namespace details
 {
     template <typename Bounds>
-    inline constexpr std::enable_if_t<
+    constexpr std::enable_if_t<
         std::is_same<typename Bounds::mapping_type, generalized_mapping_tag>::value,
         typename Bounds::index_type>
     make_stride(const Bounds& bnd) GSL_NOEXCEPT
@@ -1006,7 +1006,7 @@ namespace details
 
     // Make a stride vector from bounds, assuming contiguous memory.
     template <typename Bounds>
-    inline constexpr std::enable_if_t<
+    constexpr std::enable_if_t<
         std::is_same<typename Bounds::mapping_type, contiguous_mapping_tag>::value,
         typename Bounds::index_type>
     make_stride(const Bounds& bnd) GSL_NOEXCEPT
@@ -1056,13 +1056,13 @@ struct dim_t<dynamic_range>
 };
 
 template <std::ptrdiff_t N, class = std::enable_if_t<(N >= 0)>>
-inline constexpr dim_t<N> dim() GSL_NOEXCEPT
+constexpr dim_t<N> dim() GSL_NOEXCEPT
 {
     return dim_t<N>();
 }
 
 template <std::ptrdiff_t N = dynamic_range, class = std::enable_if_t<N == dynamic_range>>
-inline constexpr dim_t<N> dim(std::ptrdiff_t n) GSL_NOEXCEPT
+constexpr dim_t<N> dim(std::ptrdiff_t n) GSL_NOEXCEPT
 {
     return dim_t<>(n);
 }
@@ -1599,7 +1599,7 @@ public:
 // DimCount and Enabled here are workarounds for a bug in MSVC 2015
 template <typename SpanType, typename... Dimensions2, std::size_t DimCount = sizeof...(Dimensions2),
           bool Enabled = (DimCount > 0), typename = std::enable_if_t<Enabled>>
-inline constexpr auto as_multi_span(SpanType s, Dimensions2... dims)
+constexpr auto as_multi_span(SpanType s, Dimensions2... dims)
     -> multi_span<typename SpanType::value_type, Dimensions2::value...>
 {
     static_assert(details::is_multi_span<SpanType>::value,
@@ -1637,7 +1637,7 @@ multi_span<byte> as_writeable_bytes(multi_span<U, Dimensions...> s) GSL_NOEXCEPT
 // on all implementations. It should be considered an experimental extension
 // to the standard GSL interface.
 template <typename U, std::ptrdiff_t... Dimensions>
-inline constexpr auto
+constexpr auto
 as_multi_span(multi_span<const byte, Dimensions...> s) GSL_NOEXCEPT -> multi_span<
     const U, static_cast<std::ptrdiff_t>(
                  multi_span<const byte, Dimensions...>::bounds_type::static_size != dynamic_range
@@ -1664,7 +1664,7 @@ as_multi_span(multi_span<const byte, Dimensions...> s) GSL_NOEXCEPT -> multi_spa
 // on all implementations. It should be considered an experimental extension
 // to the standard GSL interface.
 template <typename U, std::ptrdiff_t... Dimensions>
-inline constexpr auto as_multi_span(multi_span<byte, Dimensions...> s) GSL_NOEXCEPT
+constexpr auto as_multi_span(multi_span<byte, Dimensions...> s) GSL_NOEXCEPT
     -> multi_span<U, narrow_cast<std::ptrdiff_t>(
                          multi_span<byte, Dimensions...>::bounds_type::static_size != dynamic_range
                              ? static_cast<std::size_t>(
@@ -1685,7 +1685,7 @@ inline constexpr auto as_multi_span(multi_span<byte, Dimensions...> s) GSL_NOEXC
 }
 
 template <typename T, std::ptrdiff_t... Dimensions>
-inline constexpr auto as_multi_span(T* const& ptr, dim_t<Dimensions>... args)
+constexpr auto as_multi_span(T* const& ptr, dim_t<Dimensions>... args)
     -> multi_span<std::remove_all_extents_t<T>, Dimensions...>
 {
     return {reinterpret_cast<std::remove_all_extents_t<T>*>(ptr),
@@ -1694,41 +1694,41 @@ inline constexpr auto as_multi_span(T* const& ptr, dim_t<Dimensions>... args)
 }
 
 template <typename T>
-inline constexpr auto as_multi_span(T* arr, std::ptrdiff_t len) ->
+constexpr auto as_multi_span(T* arr, std::ptrdiff_t len) ->
     typename details::SpanArrayTraits<T, dynamic_range>::type
 {
     return {reinterpret_cast<std::remove_all_extents_t<T>*>(arr), len};
 }
 
 template <typename T, std::size_t N>
-inline constexpr auto as_multi_span(T (&arr)[N]) -> typename details::SpanArrayTraits<T, N>::type
+constexpr auto as_multi_span(T (&arr)[N]) -> typename details::SpanArrayTraits<T, N>::type
 {
     return {arr};
 }
 
 template <typename T, std::size_t N>
-inline constexpr multi_span<const T, N> as_multi_span(const std::array<T, N>& arr)
+constexpr multi_span<const T, N> as_multi_span(const std::array<T, N>& arr)
 {
     return {arr};
 }
 
 template <typename T, std::size_t N>
-inline constexpr multi_span<const T, N> as_multi_span(const std::array<T, N>&&) = delete;
+constexpr multi_span<const T, N> as_multi_span(const std::array<T, N>&&) = delete;
 
 template <typename T, std::size_t N>
-inline constexpr multi_span<T, N> as_multi_span(std::array<T, N>& arr)
+constexpr multi_span<T, N> as_multi_span(std::array<T, N>& arr)
 {
     return {arr};
 }
 
 template <typename T>
-inline constexpr multi_span<T, dynamic_range> as_multi_span(T* begin, T* end)
+constexpr multi_span<T, dynamic_range> as_multi_span(T* begin, T* end)
 {
     return {begin, end};
 }
 
 template <typename Cont>
-inline constexpr auto as_multi_span(Cont& arr) -> std::enable_if_t<
+constexpr auto as_multi_span(Cont& arr) -> std::enable_if_t<
     !details::is_multi_span<std::decay_t<Cont>>::value,
     multi_span<std::remove_reference_t<decltype(arr.size(), *arr.data())>, dynamic_range>>
 {
@@ -1737,13 +1737,13 @@ inline constexpr auto as_multi_span(Cont& arr) -> std::enable_if_t<
 }
 
 template <typename Cont>
-inline constexpr auto as_multi_span(Cont&& arr) -> std::enable_if_t<
+constexpr auto as_multi_span(Cont&& arr) -> std::enable_if_t<
     !details::is_multi_span<std::decay_t<Cont>>::value,
     multi_span<std::remove_reference_t<decltype(arr.size(), *arr.data())>, dynamic_range>> = delete;
 
 // from basic_string which doesn't have nonconst .data() member like other contiguous containers
 template <typename CharT, typename Traits, typename Allocator>
-inline constexpr auto as_multi_span(std::basic_string<CharT, Traits, Allocator>& str)
+constexpr auto as_multi_span(std::basic_string<CharT, Traits, Allocator>& str)
     -> multi_span<CharT, dynamic_range>
 {
     Expects(str.size() < PTRDIFF_MAX);
diff --git a/include/gsl/span b/include/gsl/span
index 04cf1af..6f87633 100644
--- a/include/gsl/span
+++ b/include/gsl/span
@@ -253,7 +253,7 @@ namespace details
     };
 
     template <class Span, bool IsConst>
-    inline constexpr span_iterator<Span, IsConst>
+    constexpr span_iterator<Span, IsConst>
     operator+(typename span_iterator<Span, IsConst>::difference_type n,
               span_iterator<Span, IsConst> rhs) GSL_NOEXCEPT
     {
@@ -261,7 +261,7 @@ namespace details
     }
 
     template <class Span, bool IsConst>
-    inline constexpr span_iterator<Span, IsConst>
+    constexpr span_iterator<Span, IsConst>
     operator-(typename span_iterator<Span, IsConst>::difference_type n,
               span_iterator<Span, IsConst> rhs) GSL_NOEXCEPT
     {
@@ -535,43 +535,43 @@ private:
 
 // [span.comparison], span comparison operators
 template <class ElementType, std::ptrdiff_t FirstExtent, std::ptrdiff_t SecondExtent>
-inline constexpr bool operator==(span<ElementType, FirstExtent> l,
-                                 span<ElementType, SecondExtent> r)
+constexpr bool operator==(span<ElementType, FirstExtent> l,
+                          span<ElementType, SecondExtent> r)
 {
     return std::equal(l.begin(), l.end(), r.begin(), r.end());
 }
 
 template <class ElementType, std::ptrdiff_t Extent>
-inline constexpr bool operator!=(span<ElementType, Extent> l,
-                                 span<ElementType, Extent> r)
+constexpr bool operator!=(span<ElementType, Extent> l,
+                          span<ElementType, Extent> r)
 {
     return !(l == r);
 }
 
 template <class ElementType, std::ptrdiff_t Extent>
-inline constexpr bool operator<(span<ElementType, Extent> l,
-                                span<ElementType, Extent> r)
+constexpr bool operator<(span<ElementType, Extent> l,
+                         span<ElementType, Extent> r)
 {
     return std::lexicographical_compare(l.begin(), l.end(), r.begin(), r.end());
 }
 
 template <class ElementType, std::ptrdiff_t Extent>
-inline constexpr bool operator<=(span<ElementType, Extent> l,
-                                 span<ElementType, Extent> r)
+constexpr bool operator<=(span<ElementType, Extent> l,
+                          span<ElementType, Extent> r)
 {
     return !(l > r);
 }
 
 template <class ElementType, std::ptrdiff_t Extent>
-inline constexpr bool operator>(span<ElementType, Extent> l,
-                                span<ElementType, Extent> r)
+constexpr bool operator>(span<ElementType, Extent> l,
+                         span<ElementType, Extent> r)
 {
     return r < l;
 }
 
 template <class ElementType, std::ptrdiff_t Extent>
-inline constexpr bool operator>=(span<ElementType, Extent> l,
-                                 span<ElementType, Extent> r)
+constexpr bool operator>=(span<ElementType, Extent> l,
+                          span<ElementType, Extent> r)
 {
     return !(l < r);
 }
@@ -662,7 +662,7 @@ span<typename Ptr::element_type> make_span(Ptr& cont)
 
 // Specialization of gsl::at for span
 template <class ElementType, std::ptrdiff_t Extent>
-inline constexpr ElementType& at(span<ElementType, Extent> s, std::ptrdiff_t index)
+constexpr ElementType& at(span<ElementType, Extent> s, std::ptrdiff_t index)
 {
     // No bounds checking here because it is done in span::operator[] called below
     return s[index];
diff --git a/include/gsl/string_span b/include/gsl/string_span
index cd9ddf9..e4b186f 100644
--- a/include/gsl/string_span
+++ b/include/gsl/string_span
@@ -130,7 +130,7 @@ span<T, dynamic_extent> ensure_sentinel(T* seq, std::ptrdiff_t max = PTRDIFF_MAX
 // the limit of size_type.
 //
 template <typename CharT>
-inline span<CharT, dynamic_extent> ensure_z(CharT* const& sz, std::ptrdiff_t max = PTRDIFF_MAX)
+span<CharT, dynamic_extent> ensure_z(CharT* const& sz, std::ptrdiff_t max = PTRDIFF_MAX)
 {
     return ensure_sentinel<CharT, CharT(0)>(sz, max);
 }