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82 lines
2.2 KiB
82 lines
2.2 KiB
#include <cstdio>
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#include <sparsepp/spp.h>
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using spp::sparse_hash_map;
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using namespace std;
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class FileSerializer
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{
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public:
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// serialize basic types to FILE
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// -----------------------------
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template <class T>
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bool operator()(FILE *fp, const T& value)
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{
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return fwrite((const void *)&value, sizeof(value), 1, fp) == 1;
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}
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template <class T>
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bool operator()(FILE *fp, T* value)
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{
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return fread((void *)value, sizeof(*value), 1, fp) == 1;
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}
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// serialize std::string to FILE
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// -----------------------------
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bool operator()(FILE *fp, const string& value)
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{
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const size_t size = value.size();
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return (*this)(fp, size) && fwrite(value.c_str(), size, 1, fp) == 1;
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}
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bool operator()(FILE *fp, string* value)
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{
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size_t size;
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if (!(*this)(fp, &size))
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return false;
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char* buf = new char[size];
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if (fread(buf, size, 1, fp) != 1)
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{
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delete [] buf;
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return false;
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}
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new (value) string(buf, (size_t)size);
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delete[] buf;
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return true;
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}
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// serialize std::pair<const A, B> to FILE - needed for maps
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// ---------------------------------------------------------
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template <class A, class B>
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bool operator()(FILE *fp, const std::pair<const A, B>& value)
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{
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return (*this)(fp, value.first) && (*this)(fp, value.second);
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}
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template <class A, class B>
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bool operator()(FILE *fp, std::pair<const A, B> *value)
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{
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return (*this)(fp, (A *)&value->first) && (*this)(fp, &value->second);
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}
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};
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int main(int, char* [])
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{
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sparse_hash_map<string, int> age{ { "John", 12 }, {"Jane", 13 }, { "Fred", 8 } };
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// serialize age hash_map to "ages.dmp" file
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FILE *out = fopen("ages.dmp", "wb");
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age.serialize(FileSerializer(), out);
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fclose(out);
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sparse_hash_map<string, int> age_read;
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// read from "ages.dmp" file into age_read hash_map
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FILE *input = fopen("ages.dmp", "rb");
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age_read.unserialize(FileSerializer(), input);
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fclose(input);
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// print out contents of age_read to verify correct serialization
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for (auto& v : age_read)
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printf("age_read: %s -> %d\n", v.first.c_str(), v.second);
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}
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