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The C and C++ Include Header Files

cat -n /usr/include/wabt/result.h

     1	/*
     2	 * Copyright 2017 WebAssembly Community Group participants
     3	 *
     4	 * Licensed under the Apache License, Version 2.0 (the "License");
     5	 * you may not use this file except in compliance with the License.
     6	 * You may obtain a copy of the License at
     7	 *
     8	 *     http://www.apache.org/licenses/LICENSE-2.0
     9	 *
    10	 * Unless required by applicable law or agreed to in writing, software
    11	 * distributed under the License is distributed on an "AS IS" BASIS,
    12	 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13	 * See the License for the specific language governing permissions and
    14	 * limitations under the License.
    15	 */
    16	
    17	#ifndef WABT_RESULT_H_
    18	#define WABT_RESULT_H_
    19	
    20	namespace wabt {
    21	
    22	struct Result {
    23	  enum Enum {
    24	    Ok,
    25	    Error,
    26	  };
    27	
    28	  Result() : Result(Ok) {}
    29	  Result(Enum e) : enum_(e) {}
    30	  operator Enum() const { return enum_; }
    31	  Result& operator|=(Result rhs);
    32	
    33	 private:
    34	  Enum enum_;
    35	};
    36	
    37	inline Result operator|(Result lhs, Result rhs) {
    38	  return (lhs == Result::Error || rhs == Result::Error) ? Result::Error
    39	                                                        : Result::Ok;
    40	}
    41	
    42	inline Result& Result::operator|=(Result rhs) {
    43	  enum_ = *this | rhs;
    44	  return *this;
    45	}
    46	
    47	inline bool Succeeded(Result result) {
    48	  return result == Result::Ok;
    49	}
    50	inline bool Failed(Result result) {
    51	  return result == Result::Error;
    52	}
    53	
    54	#define CHECK_RESULT(expr)          \
    55	  do {                              \
    56	    if (Failed(expr)) {             \
    57	      return ::wabt::Result::Error; \
    58	    }                               \
    59	  } while (0)
    60	
    61	}  // namespace wabt
    62	
    63	#endif  // WABT_RESULT_H_