================
@@ -0,0 +1,194 @@
+// RUN: %check_clang_tidy -std=c++20 %s readability-use-span-first-last %t
+
+namespace std {
+
+enum class byte : unsigned char {};
+
+template <typename T>
+class span {
+ T* ptr;
+ __SIZE_TYPE__ len;
+
+public:
+ span(T* p, __SIZE_TYPE__ l) : ptr(p), len(l) {}
+
+ span<T> subspan(__SIZE_TYPE__ offset) const {
+ return span(ptr + offset, len - offset);
+ }
+
+ span<T> subspan(__SIZE_TYPE__ offset, __SIZE_TYPE__ count) const {
+ return span(ptr + offset, count);
+ }
+
+ span<T> first(__SIZE_TYPE__ count) const {
+ return span(ptr, count);
+ }
+
+ span<T> last(__SIZE_TYPE__ count) const {
+ return span(ptr + (len - count), count);
+ }
+
+ __SIZE_TYPE__ size() const { return len; }
+ __SIZE_TYPE__ size_bytes() const { return len * sizeof(T); }
+};
+} // namespace std
+
+// Add here, right after the std namespace closes:
+namespace std::ranges {
+ template<typename T>
+ __SIZE_TYPE__ size(const span<T>& s) { return s.size(); }
+}
----------------
vbvictor wrote:
This should be a separate header under
`clang-tools-extra/test/clang-tidy/checkers/Inputs/Headers/std` after
https://github.com/llvm/llvm-project/pull/185533 is merged. And you don't need
to do any manual `-I`
https://github.com/llvm/llvm-project/pull/118074
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