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diff --git a/gmp/tests/cxx/t-assign.cc b/gmp/tests/cxx/t-assign.cc
new file mode 100644
index 00000000..407f7262
--- /dev/null
+++ b/gmp/tests/cxx/t-assign.cc
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+/* Test mp*_class assignment operators.
+
+Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "config.h"
+
+#include <iostream>
+#include <string>
+
+#include "gmp.h"
+#include "gmpxx.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+using namespace std;
+
+
+void
+check_mpz (void)
+{
+  // operator=(const mpz_class &)
+  {
+    mpz_class a(123), b;
+    b = a; ASSERT_ALWAYS(b == 123);
+  }
+
+  // template <class T, class U> operator=(const __gmp_expr<T, U> &)
+  // not tested here, see t-unary.cc, t-binary.cc
+
+  // operator=(signed char)
+  {
+    signed char a = -127;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == -127);
+  }
+
+  // operator=(unsigned char)
+  {
+    unsigned char a = 255;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 255);
+  }
+
+  // either signed or unsigned char, machine dependent
+  {
+    mpz_class a;
+    a = 'A'; ASSERT_ALWAYS(a == 65);
+  }
+  {
+    mpz_class a;
+    a = 'z'; ASSERT_ALWAYS(a == 122);
+  }
+
+  // operator=(signed int)
+  {
+    signed int a = 0;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+  {
+    signed int a = -123;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == -123);
+  }
+  {
+    signed int a = 32767;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 32767);
+  }
+
+  // operator=(unsigned int)
+  {
+    unsigned int a = 65535u;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 65535u);
+  }
+
+  // operator=(signed short int)
+  {
+    signed short int a = -12345;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == -12345);
+  }
+
+  // operator=(unsigned short int)
+  {
+    unsigned short int a = 54321u;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 54321u);
+  }
+
+  // operator=(signed long int)
+  {
+    signed long int a = -1234567890L;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == -1234567890L);
+  }
+
+  // operator=(unsigned long int)
+  {
+    unsigned long int a = 3456789012UL;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 3456789012UL);
+  }
+
+  // operator=(float)
+  {
+    float a = 123.0;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 123);
+  }
+
+  // operator=(double)
+  {
+    double a = 0.0;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+  {
+    double a = -12.375;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == -12);
+  }
+  {
+    double a = 6.789e+3;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 6789);
+  }
+  {
+    double a = 9.375e-1;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+
+  // operator=(long double)
+  // currently not implemented
+
+  // operator=(const char *)
+  {
+    const char *a = "1234567890";
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 1234567890L);
+  }
+
+  // operator=(const std::string &)
+  {
+    string a("1234567890");
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 1234567890L);
+  }
+
+  // operator=(const char *) with invalid
+  {
+    try {
+      const char *a = "abc";
+      mpz_class b;
+      b = a;
+      ASSERT_ALWAYS (0);  /* should not be reached */
+    } catch (invalid_argument) {
+    }
+  }
+
+  // operator=(const std::string &) with invalid
+  {
+    try {
+      string a("def");
+      mpz_class b;
+      b = a;
+      ASSERT_ALWAYS (0);  /* should not be reached */
+    } catch (invalid_argument) {
+    }
+  }
+}
+
+void
+check_mpq (void)
+{
+  // operator=(const mpq_class &)
+  {
+    mpq_class a(1, 2), b;
+    b = a; ASSERT_ALWAYS(b == 0.5);
+  }
+
+  // template <class T, class U> operator=(const __gmp_expr<T, U> &)
+  // not tested here, see t-unary.cc, t-binary.cc
+
+  // operator=(signed char)
+  {
+    signed char a = -127;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == -127);
+  }
+
+  // operator=(unsigned char)
+  {
+    unsigned char a = 255;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 255);
+  }
+
+  // either signed or unsigned char, machine dependent
+  {
+    mpq_class a;
+    a = 'A'; ASSERT_ALWAYS(a == 65);
+  }
+  {
+    mpq_class a;
+    a = 'z'; ASSERT_ALWAYS(a == 122);
+  }
+
+  // operator=(signed int)
+  {
+    signed int a = 0;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+  {
+    signed int a = -123;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == -123);
+  }
+  {
+    signed int a = 32767;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 32767);
+  }
+
+  // operator=(unsigned int)
+  {
+    unsigned int a = 65535u;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 65535u);
+  }
+
+  // operator=(signed short int)
+  {
+    signed short int a = -12345;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == -12345);
+  }
+
+  // operator=(unsigned short int)
+  {
+    unsigned short int a = 54321u;
+    mpz_class b;
+    b = a; ASSERT_ALWAYS(b == 54321u);
+  }
+
+  // operator=(signed long int)
+  {
+    signed long int a = -1234567890L;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == -1234567890L);
+  }
+
+  // operator=(unsigned long int)
+  {
+    unsigned long int a = 3456789012UL;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 3456789012UL);
+  }
+
+  // operator=(float)
+  {
+    float a = 123.0;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 123);
+  }
+
+  // operator=(double)
+  {
+    double a = 0.0;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+  {
+    double a = -12.375;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == -12.375);
+  }
+  {
+    double a = 6.789e+3;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 6789);
+  }
+  {
+    double a = 9.375e-1;
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 0.9375);
+  }
+
+  // operator=(long double)
+  // currently not implemented
+
+  // operator=(const char *)
+  {
+    const char *a = "1234567890";
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 1234567890L);
+  }
+
+  // operator=(const std::string &)
+  {
+    string a("1234567890");
+    mpq_class b;
+    b = a; ASSERT_ALWAYS(b == 1234567890L);
+  }
+
+  // operator=(const char *) with invalid
+  {
+    try {
+      const char *a = "abc";
+      mpq_class b;
+      b = a;
+      ASSERT_ALWAYS (0);  /* should not be reached */
+    } catch (invalid_argument) {
+    }
+  }
+
+  // operator=(const std::string &) with invalid
+  {
+    try {
+      string a("def");
+      mpq_class b;
+      b = a;
+      ASSERT_ALWAYS (0);  /* should not be reached */
+    } catch (invalid_argument) {
+    }
+  }
+}
+
+void
+check_mpf (void)
+{
+  // operator=(const mpf_class &)
+  {
+    mpf_class a(123), b;
+    b = a; ASSERT_ALWAYS(b == 123);
+  }
+
+  // template <class T, class U> operator=(const __gmp_expr<T, U> &)
+  // not tested here, see t-unary.cc, t-binary.cc
+
+  // operator=(signed char)
+  {
+    signed char a = -127;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == -127);
+  }
+
+  // operator=(unsigned char)
+  {
+    unsigned char a = 255;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 255);
+  }
+
+  // either signed or unsigned char, machine dependent
+  {
+    mpf_class a;
+    a = 'A'; ASSERT_ALWAYS(a == 65);
+  }
+  {
+    mpf_class a;
+    a = 'z'; ASSERT_ALWAYS(a == 122);
+  }
+
+  // operator=(signed int)
+  {
+    signed int a = 0;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+  {
+    signed int a = -123;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == -123);
+  }
+  {
+    signed int a = 32767;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 32767);
+  }
+
+  // operator=(unsigned int)
+  {
+    unsigned int a = 65535u;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 65535u);
+  }
+
+  // operator=(signed short int)
+  {
+    signed short int a = -12345;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == -12345);
+  }
+
+  // operator=(unsigned short int)
+  {
+    unsigned short int a = 54321u;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 54321u);
+  }
+
+  // operator=(signed long int)
+  {
+    signed long int a = -1234567890L;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == -1234567890L);
+  }
+
+  // operator=(unsigned long int)
+  {
+    unsigned long int a = 3456789012UL;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 3456789012UL);
+  }
+
+  // operator=(float)
+  {
+    float a = 123.0;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 123);
+  }
+
+  // operator=(double)
+  {
+    double a = 0.0;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 0);
+  }
+  {
+    double a = -12.375;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == -12.375);
+  }
+  {
+    double a = 6.789e+3;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 6789);
+  }
+  {
+    double a = 9.375e-1;
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 0.9375);
+  }
+
+  // operator=(long double)
+  // currently not implemented
+
+  // operator=(const char *)
+  {
+    const char *a = "1234567890";
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 1234567890L);
+  }
+
+  // operator=(const std::string &)
+  {
+    string a("1234567890");
+    mpf_class b;
+    b = a; ASSERT_ALWAYS(b == 1234567890L);
+  }
+
+  // operator=(const char *) with invalid
+  {
+    try {
+      const char *a = "abc";
+      mpf_class b;
+      b = a;
+      ASSERT_ALWAYS (0);  /* should not be reached */
+    } catch (invalid_argument) {
+    }
+  }
+
+  // operator=(const std::string &) with invalid
+  {
+    try {
+      string a("def");
+      mpf_class b;
+      b = a;
+      ASSERT_ALWAYS (0);  /* should not be reached */
+    } catch (invalid_argument) {
+    }
+  }
+}
+
+
+int
+main (void)
+{
+  tests_start();
+
+  check_mpz();
+  check_mpq();
+  check_mpf();
+
+  tests_end();
+  return 0;
+}