如何序列化GMP强积金类型？ [英] How to serialize the GMP mpf type?

问题描述

看来，GMP提供强积金（浮点）的唯一字符串序列化类型：

It seems that GMP provides only string serialization of the mpf (floating point) type:

mpf_get_str（）， mpf_class :: get_str（）

在MPZ（整数）类型有原始字节额外的接口： mpz_out_raw（）

The mpz (integer) type has an additional interface for raw bytes: mpz_out_raw()

<一个href=\"http://gmplib.org/manual/Function-Index.html\">http://gmplib.org/manual/Function-Index.html

我缺少的东西吗？有谁知道，可序列化GMP花车另一个库吗？有谁知道另一个BIGNUM lib中，提供强大的序列化？

Am I missing something? Does anyone know of another library that can serialize GMP floats? Does anyone know of another bignum lib that offers robust serialization?

编辑：我很乐意与序列化MPFR的mpfr_t，以及，这​​同样似乎只提供字符串输出：<一href=\"http://www.mpfr.org/mpfr-current/mpfr.html#Function-Index\">http://www.mpfr.org/mpfr-current/mpfr.html#Function-Index

I'd be happy with serializing MPFR's mpfr_t, as well, which similarly only seems to offer string output: http://www.mpfr.org/mpfr-current/mpfr.html#Function-Index

推荐答案

这是很久以前的事，但我清盘做这​​样的这个：

This was a long time ago, but I wound up doing something like this:

int mpf_out_raw (FILE *f, mpf_t X) {
   int expt; mpz_t Z; size_t nz;
   expt = X->_mp_exp;
   fwrite(&expt, sizeof(int), 1, f);
   nz = X->_mp_size;
   Z->_mp_alloc = nz; 
   Z->_mp_size  = nz; 
   Z->_mp_d     = X->_mp_d;
   return (mpz_out_raw(f, Z) + sizeof(int));
}

void mpf_inp_raw  (FILE *f, mpf_t X) { 
   int expt; mpz_t Z; size_t nz;
   mpz_init (Z);
   fread(&expt, sizeof(int), 1, f);
   mpz_inp_raw  (Z, f);
   mpf_set_z    (X, Z); 
   X->_mp_exp   = expt;
   mpz_clear (Z);
}

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