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diff --git a/tesseract/src/classify/adaptive.h b/tesseract/src/classify/adaptive.h
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+/******************************************************************************
+ ** Filename:   adaptive.h
+ ** Purpose:    Interface to adaptive matcher.
+ ** Author:     Dan Johnson
+ **
+ ** (c) Copyright Hewlett-Packard Company, 1988.
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ ** http://www.apache.org/licenses/LICENSE-2.0
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ ******************************************************************************/
+#ifndef ADAPTIVE_H
+#define ADAPTIVE_H
+
+#include "intproto.h"
+#include "oldlist.h"
+
+#include <cstdio>
+
+namespace tesseract {
+
+typedef struct {
+  uint16_t ProtoId;
+  PROTO_STRUCT Proto;
+}
+
+TEMP_PROTO_STRUCT;
+using TEMP_PROTO = TEMP_PROTO_STRUCT*;
+
+typedef struct {
+  uint8_t NumTimesSeen;
+  uint8_t ProtoVectorSize;
+  PROTO_ID MaxProtoId;
+  BIT_VECTOR Protos;
+  int FontinfoId;  // font information inferred from pre-trained templates
+} TEMP_CONFIG_STRUCT;
+using TEMP_CONFIG = TEMP_CONFIG_STRUCT*;
+
+typedef struct {
+  UNICHAR_ID* Ambigs;
+  int FontinfoId;  // font information inferred from pre-trained templates
+} PERM_CONFIG_STRUCT;
+using PERM_CONFIG = PERM_CONFIG_STRUCT*;
+
+typedef union {
+  TEMP_CONFIG Temp;
+  PERM_CONFIG Perm;
+} ADAPTED_CONFIG;
+
+typedef struct {
+  uint8_t NumPermConfigs;
+  uint8_t MaxNumTimesSeen;  // maximum number of times any TEMP_CONFIG was seen
+                            // (cut at matcher_min_examples_for_prototyping)
+  BIT_VECTOR PermProtos;
+  BIT_VECTOR PermConfigs;
+  LIST TempProtos;
+  ADAPTED_CONFIG Config[MAX_NUM_CONFIGS];
+} ADAPT_CLASS_STRUCT;
+using ADAPT_CLASS = ADAPT_CLASS_STRUCT*;
+
+typedef struct {
+  INT_TEMPLATES Templates;
+  int NumNonEmptyClasses;
+  uint8_t NumPermClasses;
+  ADAPT_CLASS Class[MAX_NUM_CLASSES];
+} ADAPT_TEMPLATES_STRUCT;
+using ADAPT_TEMPLATES = ADAPT_TEMPLATES_STRUCT*;
+
+/*----------------------------------------------------------------------------
+          Public Function Prototypes
+----------------------------------------------------------------------------*/
+#define NumNonEmptyClassesIn(Template) ((Template)->NumNonEmptyClasses)
+
+#define IsEmptyAdaptedClass(Class) \
+  ((Class)->NumPermConfigs == 0 && (Class)->TempProtos == NIL_LIST)
+
+#define ConfigIsPermanent(Class, ConfigId) \
+  (test_bit((Class)->PermConfigs, ConfigId))
+
+#define MakeConfigPermanent(Class, ConfigId) \
+  (SET_BIT((Class)->PermConfigs, ConfigId))
+
+#define MakeProtoPermanent(Class, ProtoId) \
+  (SET_BIT((Class)->PermProtos, ProtoId))
+
+#define TempConfigFor(Class, ConfigId) ((Class)->Config[ConfigId].Temp)
+
+#define PermConfigFor(Class, ConfigId) ((Class)->Config[ConfigId].Perm)
+
+#define IncreaseConfidence(TempConfig) ((TempConfig)->NumTimesSeen++)
+
+void AddAdaptedClass(ADAPT_TEMPLATES Templates, ADAPT_CLASS Class,
+                     CLASS_ID ClassId);
+
+void FreeTempProto(void* arg);
+
+void FreeTempConfig(TEMP_CONFIG Config);
+
+ADAPT_CLASS NewAdaptedClass();
+
+void free_adapted_class(ADAPT_CLASS adapt_class);
+
+void free_adapted_templates(ADAPT_TEMPLATES templates);
+
+TEMP_CONFIG NewTempConfig(int MaxProtoId, int FontinfoId);
+
+TEMP_PROTO NewTempProto();
+
+ADAPT_CLASS ReadAdaptedClass(tesseract::TFile* File);
+
+PERM_CONFIG ReadPermConfig(tesseract::TFile* File);
+
+TEMP_CONFIG ReadTempConfig(tesseract::TFile* File);
+
+void WriteAdaptedClass(FILE* File, ADAPT_CLASS Class, int NumConfigs);
+
+void WritePermConfig(FILE* File, PERM_CONFIG Config);
+
+void WriteTempConfig(FILE* File, TEMP_CONFIG Config);
+
+} // namespace tesseract
+
+#endif