1 files changed, 50 insertions, 0 deletions
diff --git a/klm/util/ersatz_progress.hh b/klm/util/ersatz_progress.hh
new file mode 100644
index 00000000..ea6c3bb9
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+++ b/klm/util/ersatz_progress.hh
@@ -0,0 +1,50 @@
+#ifndef UTIL_ERSATZ_PROGRESS__
+#define UTIL_ERSATZ_PROGRESS__
+
+#include <iosfwd>
+#include <string>
+
+// Ersatz version of boost::progress so core language model doesn't depend on
+// boost.  Also adds option to print nothing.  
+
+namespace util {
+class ErsatzProgress {
+  public:
+    // No output.  
+    ErsatzProgress();
+
+    // Null means no output.  The null value is useful for passing along the ostream pointer from another caller.   
+    ErsatzProgress(std::ostream *to, const std::string &message, std::size_t complete);
+
+    ~ErsatzProgress();
+
+    ErsatzProgress &operator++() {
+      if (++current_ == next_) Milestone();
+      return *this;
+    }
+
+    ErsatzProgress &operator+=(std::size_t amount) {
+      if ((current_ += amount) >= next_) Milestone();
+      return *this;
+    }
+
+    void Set(std::size_t to) {
+      if ((current_ = to) >= next_) Milestone();
+      Milestone();
+    }
+
+  private:
+    void Milestone();
+
+    std::size_t current_, next_, complete_;
+    unsigned char stones_written_;
+    std::ostream *out_;
+
+    // noncopyable
+    ErsatzProgress(const ErsatzProgress &other);
+    ErsatzProgress &operator=(const ErsatzProgress &other);
+};
+
+} // namespace util
+
+#endif // UTIL_ERSATZ_PROGRESS__