2005-12-07 Anton Pevtsov <antonp@moscow.vdiweb.com>

	    Martin Sebor  <sebor@roguewave.com>

	STDCXX-4
	* 25.generate.cpp: New test exercising lib.alg.generate. Also
	exercises STDCXX-83.


git-svn-id: https://svn.apache.org/repos/asf/incubator/stdcxx/trunk@354939 13f79535-47bb-0310-9956-ffa450edef68

tests/algorithms/25.generate.cpp

@@ -0,0 +1,349 @@
+/***************************************************************************
+ *
+ * 25.generate.cpp - test exercising 25.2.6 [lib.alg.generate]
+ *
+ * $Id$
+ *
+ ***************************************************************************
+ *
+ * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
+ * Software division. 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.
+ * 
+ **************************************************************************/
+
+#include <algorithm>    // for generate
+#include <cstddef>      // for size_t
+
+#include <alg_test.h>
+#include <driver.h>     // for rw_test()
+
+/**************************************************************************/
+
+template <class T>
+struct Generator
+{
+    // return a const reference to avoid requiring
+    // that T be copy-constructible
+    const T& operator() () const {
+        static const union {
+            void*         align_;
+            unsigned char buf_ [sizeof (T)];
+        } u = { 0 };
+        return *(const T*)(const void*)&u;
+    }
+};
+
+
+_RWSTD_SPECIALIZED_CLASS
+struct Generator<X>
+{
+    // dummy arguments provided to prevent Generator
+    // from being DefaultConstructible
+    Generator (int, int /* dummy */) {
+        // use the generator of sequential values
+        X::gen_ = gen_seq;
+    }
+
+    X operator() () /* non-const */ {
+        // return a default-constructed X intialized
+        // to the next sequential value
+        return X ();
+    }
+};
+
+
+// Size template argument to generate_n()
+struct Size
+{
+    // dummy argument provided to prevent Size from being constructible
+    // by conversion from size_t
+    Size (int val, int /* dummy */ )
+        : val_ (val) { /* empty */ }
+
+    // Size must be convertible to an integral type
+    operator int () const { return val_; }
+
+private:
+
+    int val_;
+};
+
+/**************************************************************************/
+
+_RWSTD_NAMESPACE (std) { 
+
+// disable explicit instantiation for compilers (like MSVC)
+// that can't handle it
+#ifndef _RWSTD_NO_EXPLICIT_INSTANTIATION
+
+template 
+void generate (FwdIter<assign<base<> > >, FwdIter<assign<base<> > >,
+               Generator<assign<base<> > >);
+
+template
+void generate_n (OutputIter<assign<base<> > >, std::size_t,
+                 Generator<assign<base<> > >);
+
+#endif // _RWSTD_NO_EXPLICIT_INSTANTIATION
+
+}   // namespace std
+
+/**************************************************************************/
+
+// exercises std::generate() 
+template <class ForwardIterator, class T>
+void test_generate (std::size_t N,
+                    const ForwardIterator& gen_iter,
+                    const T* )
+{
+    static const char* const itname  = type_name (gen_iter, (T*) 0);
+    static const char* const genname = "Generator";
+
+    rw_info (0, 0, 0, 
+             "void std::generate (%s, %1$s, %s)", itname, genname);
+
+    // generate sequential values for each default constructed T
+    T::gen_ = gen_seq;
+
+    T *buf = new X [N];
+
+    for (std::size_t i = 0; i < N; ++i) {
+
+        // exercise 25.2.6, std::generate<> ()
+        std::size_t last_n_op_assign = T::n_total_op_assign_;
+
+        T* const buf_end = buf + i + 1;
+
+        const ForwardIterator begin =
+            make_iter (buf, buf, buf_end, gen_iter);
+
+        const ForwardIterator end =
+            make_iter (buf_end, buf_end, buf_end, gen_iter);
+
+        const Generator<T> gen (0, 0);
+
+        // store the value of the next element
+        const int last_val = Generator<T>(0, 0)().val_;
+
+        std::generate (begin, end, gen);
+
+        bool success = true;
+
+        // verify 25.2.6, p2
+        std::size_t j = 0;
+        for ( ; j != i; ++j) {
+            success = (begin.cur_ + j)->val_ == int (last_val + j + 1);
+            if (!success)
+                break;
+        }
+
+        rw_assert (success, 0, __LINE__, 
+                   "%zu. generate (): buf[%zu]: %d != %d",
+                   i + 1, j, last_val + j + 1, (begin.cur_ + j)->val_ );
+
+        if (!success)
+            break;
+
+        // verify 25.2.6, p3
+        success = T::n_total_op_assign_ - last_n_op_assign == i + 1;
+        rw_assert (success, 0, __LINE__, 
+                   "%zu. generate (): complexity: %zu != %zu",
+                   i + 1, T::n_total_op_assign_ - last_n_op_assign, i + 1);
+
+        if (!success)
+            break;
+    }
+
+    delete (buf);
+}
+
+/**************************************************************************/
+
+// exercises std::generate_n() 
+template <class ForwardIterator, class Size, class T>
+void test_generate_n (std::size_t            N,
+                      const ForwardIterator &gen_iter,
+                      const Size*,
+                      const T*)
+{
+    static const char* const itname  = type_name (gen_iter, (T*) 0);
+    static const char* const szname  = "Size";
+    static const char* const genname = "Generator";
+
+    rw_info (0, 0, 0, 
+             "void std::generate_n (%s, %s, %s)", itname, szname, genname);
+
+    // generate sequential values for each default constructed T
+    T::gen_ = gen_seq;
+
+    T *buf = new X [N];
+
+    for (std::size_t i = 0; i <= N; ++i) {
+
+        std::size_t last_n_op_assign = T::n_total_op_assign_;
+
+        T* const buf_end = buf + i + 1;
+
+        const ForwardIterator begin =
+            make_iter (buf, buf, buf_end, gen_iter);
+
+        const Size sz (i, 0);
+        const Generator<T> gen (0, 0);
+
+        // store the value of the next element
+        const int last_val = Generator<T>(0, 0)().val_;
+
+        std::generate_n (begin, sz, gen);
+
+        bool success = true;
+
+        // verify 25.2.6, p2
+        std::size_t j = 0;
+        for ( ; j != i; ++j) {
+            success = (begin.cur_ + j)->val_ == int (last_val + j + 1);
+            if (!success)
+                break;
+        }
+
+        rw_assert (success, 0, __LINE__, 
+                   "%zu. generate_n (): buf[%zu]: %d != %d",
+                   i + 1, j, last_val + j + 1, (begin.cur_ + j)->val_ );
+
+        if (!success)
+            break;
+
+        // verify 25.2.6, p3
+        success = T::n_total_op_assign_ - last_n_op_assign == i;
+        rw_assert (success, 0, __LINE__, 
+                   "%zu. generate_n (): complexity: %zu != %zu",
+                   i + 1, T::n_total_op_assign_ - last_n_op_assign, i);
+
+        if (!success)
+            break;
+    }
+
+    ::operator delete (buf);
+}
+
+/**************************************************************************/
+
+/* extern */ int rw_opt_nloops = 32;     // --nloops
+/* extern */ int rw_opt_no_output_iter;  // --no-OutputIterator
+/* extern */ int rw_opt_no_fwd_iter;     // --no-ForwardIterator
+/* extern */ int rw_opt_no_bidir_iter;   // --no-BidirectionalIterator
+/* extern */ int rw_opt_no_rnd_iter;     // --no-RandomAccessIterator
+
+static void
+test_generate (const std::size_t N)
+{
+    rw_info (0, 0, 0,
+             "template <class %s, class %s> "
+             "void std::generate (%1$s, %1$s, %2$s&)",
+             "ForwardIterator", "Generator");
+
+    if (rw_opt_no_fwd_iter) {
+        rw_note (0, __FILE__, __LINE__, "ForwardIterator test disabled");
+    }
+    else {
+        test_generate (N, FwdIter<X>(), (X*)0);
+    }
+
+    if (rw_opt_no_bidir_iter) {
+        rw_note (0, __FILE__, __LINE__, "BidirectionalIterator test disabled");
+    }
+    else {
+        test_generate (N, BidirIter<X>(), (X*)0);
+    }
+
+    if (rw_opt_no_rnd_iter) {
+        rw_note (0, __FILE__, __LINE__,  "RandomAccessIterator test disabled");
+    }
+    else {
+        test_generate (N, RandomAccessIter<X>(), (X*)0);
+    }
+}
+
+/**************************************************************************/
+
+static void
+test_generate_n (const std::size_t N)
+{
+    rw_info (0, 0, 0,
+             "template <class %s, class %s, class %s> "
+             "void std::generate_n (%1$s, %2$s, const %3$s&)",
+             "OutputIterator", "Size", "Generator");
+
+    if (rw_opt_no_output_iter) {
+        rw_note (0, __FILE__, __LINE__, "OutputIterator test disabled");
+    }
+    else {
+        test_generate_n (N, OutputIter<X>(0, 0, 0), (Size*)0, (X*)0);
+    }
+
+    if (rw_opt_no_fwd_iter) {
+        rw_note (0, __FILE__, __LINE__, "ForwardIterator test disabled");
+    }
+    else {
+        test_generate_n (N, FwdIter<X>(), (Size*)0, (X*)0);
+    }
+
+    if (rw_opt_no_bidir_iter) {
+        rw_note (0, __FILE__, __LINE__, "BidirectionalIterator test disabled");
+    }
+    else {
+        test_generate_n (N, BidirIter<X>(), (Size*)0, (X*)0);
+    }
+
+    if (rw_opt_no_rnd_iter) {
+        rw_note (0, __FILE__, __LINE__, "RandomAccessIterator test disabled");
+    }
+    else {
+        test_generate_n (N, RandomAccessIter<X>(), (Size*)0, (X*)0);
+    }
+}
+
+/**************************************************************************/
+
+static int
+run_test (int, char*[])
+{
+    // check that the number of loops is non-negative
+    rw_fatal (-1 < rw_opt_nloops, 0, 0,
+              "number of loops must be non-negative, got %d",
+              rw_opt_nloops);
+
+    const std::size_t N = std::size_t (rw_opt_nloops);
+
+    test_generate (N);
+
+    test_generate_n (N);
+
+    return 0;
+}
+
+/**************************************************************************/
+
+int main (int argc, char *argv[])
+{
+    return rw_test (argc, argv, __FILE__,
+                    "lib.alg.generate",
+                    0 /* no comment */, run_test,
+                    "|-nloops# "
+                    "|-no-OutputIterator# "
+                    "|-no-ForwardIterator# "
+                    "|-no-BidirectionalIterator# "
+                    "|-no-RandomAccessIterator#",
+                    &rw_opt_nloops,
+                    &rw_opt_no_output_iter,
+                    &rw_opt_no_fwd_iter,
+                    &rw_opt_no_bidir_iter,
+                    &rw_opt_no_rnd_iter);
+}