/usr/include/fst/compat.h is in libfst-dev 1.5.3+r3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// 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.
//
// Author: riley@google.com (Michael Riley)
//
// \file
// Google compatibility declarations and inline definitions.
#ifndef FST_LIB_COMPAT_H_
#define FST_LIB_COMPAT_H_
#include <climits>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <vector>
// Makes copy constructor and operator= private
#define DISALLOW_COPY_AND_ASSIGN(type) \
type(const type&); \
void operator=(const type&)
#include <fst/config.h>
#include <fst/types.h>
#include <fst/lock.h>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/icu.h>
using std::string;
void FailedNewHandler();
namespace fst {
// Downcasting
template<typename To, typename From>
inline To down_cast(From* f) {
return static_cast<To>(f);
}
// Bitcasting
template <class Dest, class Source>
inline Dest bit_cast(const Source& source) {
// Compile time assertion: sizeof(Dest) == sizeof(Source)
// A compile error here means your Dest and Source have different sizes.
typedef char VerifySizesAreEqual [sizeof(Dest) == sizeof(Source) ? 1 :
-1];
Dest dest;
memcpy(&dest, &source, sizeof(dest));
return dest;
}
// Check sums
class CheckSummer {
public:
CheckSummer() : count_(0) {
check_sum_.resize(kCheckSumLength, '\0');
}
void Reset() {
count_ = 0;
for (int i = 0; i < kCheckSumLength; ++i)
check_sum_[i] = '\0';
}
void Update(void const *data, int size) {
const char *p = reinterpret_cast<const char *>(data);
for (int i = 0; i < size; ++i)
check_sum_[(count_++) % kCheckSumLength] ^= p[i];
}
void Update(string const &data) {
for (int i = 0; i < data.size(); ++i)
check_sum_[(count_++) % kCheckSumLength] ^= data[i];
}
string Digest() {
return check_sum_;
}
private:
static const int kCheckSumLength = 32;
int count_;
string check_sum_;
DISALLOW_COPY_AND_ASSIGN(CheckSummer);
};
} // namespace fst
#endif // FST_LIB_COMPAT_H_
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