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dist/trunk/emio.hpp

@@ -1524,6 +1524,10 @@ class ct_vector {
     size_ = new_size;
   }
 
+  constexpr void clear() noexcept {
+    size_ = 0;
+  }
+
   [[nodiscard]] constexpr size_t capacity() const noexcept {
     return capacity_;
   }
@@ -1700,6 +1704,15 @@ class memory_buffer final : public buffer {
     return std::string{view()};
   }
 
+  /**
+   * Resets the buffer's read and write position to the beginning of the internal storage.
+   */
+  constexpr void reset() noexcept {
+    used_ = 0;
+    vec_.clear();
+    static_cast<void>(request_write_area(0, vec_.capacity()));
+  }
+
  protected:
   constexpr result<std::span<char>> request_write_area(const size_t used, const size_t size) noexcept override {
     const size_t new_size = vec_.size() + size;
@@ -1755,6 +1768,13 @@ class span_buffer : public buffer {
     return std::string{view()};
   }
 
+  /**
+   * Resets the buffer's read and write position to the beginning of the span.
+   */
+  constexpr void reset() noexcept {
+    this->set_write_area(span_);
+  }
+
  private:
   std::span<char> span_;
 };
@@ -2028,6 +2048,14 @@ class file_buffer final : public buffer {
     return success;
   }
 
+  /**
+   * Resets the buffer's read and write position to the beginning of the file stream.
+   */
+  constexpr void reset() noexcept {
+    this->set_write_area(cache_);
+    std::fseek(file_, 0, SEEK_SET);
+  }
+
  protected:
   result<std::span<char>> request_write_area(const size_t /*used*/, const size_t size) noexcept override {
     EMIO_TRYV(flush());