Lots of work.

INSTALL

@@ -1,6 +1,234 @@
-Run the commands below or refer to the autotools documentation for more
+Installation Instructions
-sophisticated options.
+*************************
+
+Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
+2006 Free Software Foundation, Inc.
+
+This file is free documentation; the Free Software Foundation gives
+unlimited permission to copy, distribute and modify it.
+
+Basic Installation
+==================
+
+Briefly, the shell commands `./configure; make; make install' should
+configure, build, and install this package.  The following
+more-detailed instructions are generic; see the `README' file for
+instructions specific to this package.
+
+   The `configure' shell script attempts to guess correct values for
+various system-dependent variables used during compilation.  It uses
+those values to create a `Makefile' in each directory of the package.
+It may also create one or more `.h' files containing system-dependent
+definitions.  Finally, it creates a shell script `config.status' that
+you can run in the future to recreate the current configuration, and a
+file `config.log' containing compiler output (useful mainly for
+debugging `configure').
+
+   It can also use an optional file (typically called `config.cache'
+and enabled with `--cache-file=config.cache' or simply `-C') that saves
+the results of its tests to speed up reconfiguring.  Caching is
+disabled by default to prevent problems with accidental use of stale
+cache files.
+
+   If you need to do unusual things to compile the package, please try
+to figure out how `configure' could check whether to do them, and mail
+diffs or instructions to the address given in the `README' so they can
+be considered for the next release.  If you are using the cache, and at
+some point `config.cache' contains results you don't want to keep, you
+may remove or edit it.
+
+   The file `configure.ac' (or `configure.in') is used to create
+`configure' by a program called `autoconf'.  You need `configure.ac' if
+you want to change it or regenerate `configure' using a newer version
+of `autoconf'.
+
+The simplest way to compile this package is:
+
+  1. `cd' to the directory containing the package's source code and type
+     `./configure' to configure the package for your system.
+
+     Running `configure' might take a while.  While running, it prints
+     some messages telling which features it is checking for.
+
+  2. Type `make' to compile the package.
+
+  3. Optionally, type `make check' to run any self-tests that come with
+     the package.
+
+  4. Type `make install' to install the programs and any data files and
+     documentation.
+
+  5. You can remove the program binaries and object files from the
+     source code directory by typing `make clean'.  To also remove the
+     files that `configure' created (so you can compile the package for
+     a different kind of computer), type `make distclean'.  There is
+     also a `make maintainer-clean' target, but that is intended mainly
+     for the package's developers.  If you use it, you may have to get
+     all sorts of other programs in order to regenerate files that came
+     with the distribution.
+
+Compilers and Options
+=====================
+
+Some systems require unusual options for compilation or linking that the
+`configure' script does not know about.  Run `./configure --help' for
+details on some of the pertinent environment variables.
+
+   You can give `configure' initial values for configuration parameters
+by setting variables in the command line or in the environment.  Here
+is an example:
+
+     ./configure CC=c99 CFLAGS=-g LIBS=-lposix
+
+   *Note Defining Variables::, for more details.
+
+Compiling For Multiple Architectures
+====================================
+
+You can compile the package for more than one kind of computer at the
+same time, by placing the object files for each architecture in their
+own directory.  To do this, you can use GNU `make'.  `cd' to the
+directory where you want the object files and executables to go and run
+the `configure' script.  `configure' automatically checks for the
+source code in the directory that `configure' is in and in `..'.
+
+   With a non-GNU `make', it is safer to compile the package for one
+architecture at a time in the source code directory.  After you have
+installed the package for one architecture, use `make distclean' before
+reconfiguring for another architecture.
+
+Installation Names
+==================
+
+By default, `make install' installs the package's commands under
+`/usr/local/bin', include files under `/usr/local/include', etc.  You
+can specify an installation prefix other than `/usr/local' by giving
+`configure' the option `--prefix=PREFIX'.
+
+   You can specify separate installation prefixes for
+architecture-specific files and architecture-independent files.  If you
+pass the option `--exec-prefix=PREFIX' to `configure', the package uses
+PREFIX as the prefix for installing programs and libraries.
+Documentation and other data files still use the regular prefix.
+
+   In addition, if you use an unusual directory layout you can give
+options like `--bindir=DIR' to specify different values for particular
+kinds of files.  Run `configure --help' for a list of the directories
+you can set and what kinds of files go in them.
+
+   If the package supports it, you can cause programs to be installed
+with an extra prefix or suffix on their names by giving `configure' the
+option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
+
+Optional Features
+=================
+
+Some packages pay attention to `--enable-FEATURE' options to
+`configure', where FEATURE indicates an optional part of the package.
+They may also pay attention to `--with-PACKAGE' options, where PACKAGE
+is something like `gnu-as' or `x' (for the X Window System).  The
+`README' should mention any `--enable-' and `--with-' options that the
+package recognizes.
+
+   For packages that use the X Window System, `configure' can usually
+find the X include and library files automatically, but if it doesn't,
+you can use the `configure' options `--x-includes=DIR' and
+`--x-libraries=DIR' to specify their locations.
+
+Specifying the System Type
+==========================
+
+There may be some features `configure' cannot figure out automatically,
+but needs to determine by the type of machine the package will run on.
+Usually, assuming the package is built to be run on the _same_
+architectures, `configure' can figure that out, but if it prints a
+message saying it cannot guess the machine type, give it the
+`--build=TYPE' option.  TYPE can either be a short name for the system
+type, such as `sun4', or a canonical name which has the form:
+
+     CPU-COMPANY-SYSTEM
+
+where SYSTEM can have one of these forms:
+
+     OS KERNEL-OS
+
+   See the file `config.sub' for the possible values of each field.  If
+`config.sub' isn't included in this package, then this package doesn't
+need to know the machine type.
+
+   If you are _building_ compiler tools for cross-compiling, you should
+use the option `--target=TYPE' to select the type of system they will
+produce code for.
+
+   If you want to _use_ a cross compiler, that generates code for a
+platform different from the build platform, you should specify the
+"host" platform (i.e., that on which the generated programs will
+eventually be run) with `--host=TYPE'.
+
+Sharing Defaults
+================
+
+If you want to set default values for `configure' scripts to share, you
+can create a site shell script called `config.site' that gives default
+values for variables like `CC', `cache_file', and `prefix'.
+`configure' looks for `PREFIX/share/config.site' if it exists, then
+`PREFIX/etc/config.site' if it exists.  Or, you can set the
+`CONFIG_SITE' environment variable to the location of the site script.
+A warning: not all `configure' scripts look for a site script.
+
+Defining Variables
+==================
+
+Variables not defined in a site shell script can be set in the
+environment passed to `configure'.  However, some packages may run
+configure again during the build, and the customized values of these
+variables may be lost.  In order to avoid this problem, you should set
+them in the `configure' command line, using `VAR=value'.  For example:
+
+     ./configure CC=/usr/local2/bin/gcc
+
+causes the specified `gcc' to be used as the C compiler (unless it is
+overridden in the site shell script).
+
+Unfortunately, this technique does not work for `CONFIG_SHELL' due to
+an Autoconf bug.  Until the bug is fixed you can use this workaround:
+
+     CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
+
+`configure' Invocation
+======================
+
+`configure' recognizes the following options to control how it operates.
+
+`--help'
+`-h'
+     Print a summary of the options to `configure', and exit.
+
+`--version'
+`-V'
+     Print the version of Autoconf used to generate the `configure'
+     script, and exit.
+
+`--cache-file=FILE'
+     Enable the cache: use and save the results of the tests in FILE,
+     traditionally `config.cache'.  FILE defaults to `/dev/null' to
+     disable caching.
+
+`--config-cache'
+`-C'
+     Alias for `--cache-file=config.cache'.
+
+`--quiet'
+`--silent'
+`-q'
+     Do not print messages saying which checks are being made.  To
+     suppress all normal output, redirect it to `/dev/null' (any error
+     messages will still be shown).
+
+`--srcdir=DIR'
+     Look for the package's source code in directory DIR.  Usually
+     `configure' can determine that directory automatically.
+
+`configure' also accepts some other, not widely useful, options.  Run
+`configure --help' for more details.
 
-./configure --prefix=/usr
-make
-sudo make install

Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = src tests examples man
+SUBDIRS = src tests examples cxxmph man
 EXTRA_DIST = cmph.spec configure.ac cmph.pc.in
 
 pkgconfigdir = $(libdir)/pkgconfig

configure.ac

@@ -37,4 +37,4 @@ dnl Checks for library functions.
 
 AC_CHECK_SPOON
 dnl AC_OUTPUT(Makefile tests/Makefile samples/Makefile)
-AC_OUTPUT(Makefile src/Makefile tests/Makefile examples/Makefile man/Makefile cmph.pc)
+AC_OUTPUT(Makefile src/Makefile cxxmph/Makefile tests/Makefile examples/Makefile man/Makefile cmph.pc)

cxxmph/Makefile.am

@@ -1,6 +1,8 @@
 bin_PROGRAMS = cmph_hash_map_test
+lib_LTLIBRARIES = libcxxmph.la
 
-INCLUDES = -I../src/
+libcxxmph_la_SOURCES = trigragh.h trigraph.cc
+libcxxmph_la_LDFLAGS = -version-info 0:0:0
 
-cmph_hash_map_test_LDADD   = ../src/libcmph.la
+cmph_hash_map_test_LDADD   = libcxxmph.la
 cmph_hash_map_test_SOURCES = cmph_hash_map_test.cc

cxxmph/cmph_hash_map.h

@@ -1,4 +1,4 @@
-#include <hash_map>
+#include <ext/hash_map>
 #include <vector>
 #include <utility>  // for std::pair
 

cxxmph/mphtable.cc

@@ -1,37 +1,105 @@
 #include <numerical_limits>
 
-template <int n, int mask = 1 << 7> struct bitcount {
+#include "mphtable.h"
-  enum { value = (n & mask ? 1:0) + bitcount<n, mask >> 1>::value };
-};
-template <int n> struct bitcount<n, 0> { enum { value = 0 }; };
 
-template <int n, int current, int mask = 1 << 8> struct bitposition {
+using std::vector;
-  enum 
 
-template <int index = 0, typename op> class CompileTimeByteTable {
+template <class Key, class HashFcn>
- public:
+template <class ForwardIterator>
-  CompileTimeByteTable : current(op<index>::value) { }
-  int operator[] (int i) { return *(&current + i); }
-private:
-  unsigned char current;
-  CompileTimeByteTable<next> next;
-};
 
-static CompileTimeByteTable<256, bitcount> BitcountTable;
+void MPHTable::Reset(ForwardIterator begin, ForwardIterator end) {
+  TableBuilderState st;
+  st.c = 1.23;
+  st.b = 7;
+  st.m = end - begin;
+  st.r = static_cast<cmph_uint32>(ceil((st.c*st.m)/3));
+  if ((st.r % 2) == 0) st.r += 1;
+  st.n = 3*st.r;
+  st.k = 1U << st.b;
+  st.ranktablesize = static_cast<cmph_uint32>(
+      ceil(st.n / static_cast<double>(st.k)));
+  st.graph_builder = TriGraph(st.m, st.n);  // giant copy
+  st.edges_queue.resize(st.m)
 
+  int iterations = 1000;
+  while (1) {
+    hasher hasher0 = HashFcn(); 
+    ok = Mapping(st.graph_builder, st.edges_queue);
+    if (ok) break;
+    else --iterations;
+    if (iterations == 0) break;
+  }
+  if (iterations == 0) return false;
+  vector<ConnectedEdge> graph;
+  st.graph_builder.ExtractEdgesAndClear(&graph);
+  Assigning(graph, st.edges_queue);
+  vector<cmph_uint32>().swap(st.edges_queue);
+  Ranking(graph);
   
-#define mix(a,b,c) \
-{ \
-        a -= b; a -= c; a ^= (c>>13); \
-        b -= c; b -= a; b ^= (a<<8); \
-        c -= a; c -= b; c ^= (b>>13); \
-        a -= b; a -= c; a ^= (c>>12);  \
-        b -= c; b -= a; b ^= (a<<16); \
-        c -= a; c -= b; c ^= (b>>5); \
-        a -= b; a -= c; a ^= (c>>3);  \
-        b -= c; b -= a; b ^= (a<<10); \
-        c -= a; c -= b; c ^= (b>>15); \
 }
 
+template <class Key, class HashFcn>
+int MPHTable::GenerateQueue(
+    cmph_uint32 nedges, cmph_uint32 nvertices,
+    TriGraph* graph, Queue* queue) {
+  cmph_uint32 queue_head = 0, queue_tail = 0;
+  // Relies on vector<bool> using 1 bit per element
+  vector<bool> marked_edge((nedges >> 3) + 1, false);
+  queue->swap(Queue(nvertices, 0));
+  for (int i = 0; i < nedges; ++i) {
+    TriGraph::Edge e = graph.edges[i].vertices;
+    if (graph.vertex_degree_[e.vertices[0]] == 1 ||
+        graph.vertex_degree_[e.vertices[1]] == 1 ||
+        graph.vertex_degree[e.vertices[2]] == 1) {
+      if (!marked_edge[i]) {
+        (*queue)[queue_head++] = i;
+        marked_edge[i] = true;
+      }
+    }
+  }
+  while (queue_tail != queue_head) {
+    cmph_uint32 current_edge = (*queue)[queue_tail++];
+    graph->RemoveEdge(current_edge);
+    TriGraph::Edge e = graph->edges[current_edge];
+    for (int i = 0; i < 3; ++i) {
+      cmph_uint32 v = e.vertices[i];
+      if (graph->vertex_degree[v] == 1) {
+        cmph_uint32 first_edge = graph->first_edge_[v];
+        if (!marked_edge[first_edge) {
+          queue[queue_head++] = first_edge;
+          marked_edge[first_edge] = true;
+        }
+      }
+    }
+  }
+  vector<bool>().swap(marked_edge);
+  return queue_head - nedges;
+}
 
-static const int kMaskStepSelectTable = std::limit<char>::max;
+template <class Key, class HashFcn>
+int MPHTable::Mapping(TriGraph* graph, Queue* queue) {
+  int cycles = 0;
+  graph->Reset(m, n);
+  for (ForwardIterator it = begin_; it != end_; ++it) { 
+    cmph_uint32 hash_values[3];
+    for (int i = 0; i < 3; ++i) {
+      hash_values[i] = hasher_(*it);
+    }
+    cmph_uint32 v0 = hash_values[0] % bdz->r;
+    cmph_uint32 v1 = hash_values[1] % bdz->r + bdz->r;
+    cmph_uint32 v2 = hash_values[2] % bdz->r + (bdz->r << 1);
+    graph->AddEdge(Edge(v0, v1, v2));
+  }
+  cycles = GenerateQueue(bdz->m, bdz->n, queue, graph);
+  return cycles == 0;
+}
+
+void MPHTable::Assigning(TriGraph* graph, Queue* queue) {
+}
+void MPHTable::Ranking(TriGraph* graph, Queue* queue) {
+}
+cmph_uint32 MPHTable::Search(const key_type& key) {
+}
+
+cmph_uint32 MPHTable::Rank(const key_type& key) {
+}

cxxmph/mphtable.h

@@ -1,83 +1,44 @@
 // Minimal perfect hash abstraction implementing the BDZ algorithm
 
+#include <vector>
+
 #include "trigraph.h"
 
-template <class Key>
+template <class Key, class NewRandomlySeededHashFcn = __gnu_cxx::hash<Key> >
 class MPHTable {
  public:
   typedef Key key_type;
+  typedef NewRandomlySeededHashFcn hasher;
   MPHTable();
   ~MPHTable();
 
-  template <class Iterator>
+  template <class ForwardIterator>
   bool Reset(ForwardIterator begin, ForwardIterator end);
   cmph_uint32 index(const key_type& x) const;
 
  private:
-  typedef vector<cmph_uint32> Queue;
+  typedef std::vector<cmph_uint32> Queue;
+  template<class ForwardIterator>
+  struct TableBuilderState {
+    ForwardIterator begin;
+    ForwardIterator end;
+    Queue edges_queue;
+    TriGraph graph_builder;
+    double c;
+    cmph_uint32 m;
+    cmph_uint32 n;
+    cmph_uint32 k;
+    cmph_uint32 ranktablesize;
+  };
   int GenerateQueue(
      cmph_uint32 nedges, cmph_uint32 nvertices,
      TriGraph* graph, Queue* queue);
+   void Assigning(TriGraph* graph, Queue* queue);
+   void Ranking(TriGraph* graph, Queue* queue);
+   cmph_uint32 Search(const StringPiece& key);
+   cmph_uint32 Rank(const StringPiece& key);
 
-  // Generates three hash values for k in a single pass.
+  std::vector<ConnectedEdge> graph_;
-  static hash_vector(cmph_uint32 seed, const char* k, cmph_uint32 keylen, cmph_uint32* hashes) ;
 };
 
-int MPHTable::GenerateQueue(
-  cmph_uint32 nedges, cmph_uint32 nvertices,
-TriGraph* graph, Queue* queue) {
-  cmph_uint32 queue_head = 0, queue_tail = 0;
-  vector<bool> marked_edge((nedges >> 3) + 1, false);
-  queue->swap(Queue(nvertices, 0));
-  for (int i = 0; i < nedges; ++i) {
-    TriGraph::Edge e = graph.edges[i].vertices;
-    if (graph.vertex_degree_[e.vertices[0]] == 1 ||
-        graph.vertex_degree_[e.vertices[1]] == 1 ||
-        graph.vertex_degree[e.vertices[2]] == 1) {
-      if (!marked_edge[i]) {
-        (*queue)[queue_head++] = i;
-        marked_edge[i] = true;
-      }
-    }
-  }
-  while (queue_tail != queue_head) {
-    cmph_uint32 current_edge = (*queue)[queue_tail++];
-    graph->RemoveEdge(current_edge);
-    TriGraph::Edge e = graph->edges[current_edge];
-    for (int i = 0; i < 3; ++i) {
-      cmph_uint32 v = e.vertices[i];
-      if (graph->vertex_degree[v] == 1) {
-        cmph_uint32 first_edge = graph->first_edge_[v];
-        if (!marked_edge[first_edge) {
-          queue[queue_head++] = first_edge;
-          marked_edge[first_edge] = true;
-        }
-      }
-    }
-  }
-  marked_edge.swap(vector<bool>());
-  return queue_head - nedges;
-}
 
-int MPHTable::Mapping(TriGraph* graph, Queue* queue) {
-  int cycles = 0;
-  cmph_uint32 hl[3];
-  graph->Reset(m, n);
-  ForwardIterator it = begin;
-  for (cmph_uint32 e = 0; e < end - begin; ++e) {
-    cmph_uint32 h0, h1, h2;
-    StringPiece key = *it; 
-    hash_vector(bdz->hl, key.data(), key.len(), hl);
-    h0 = hl[0] % bdz->r;
-    h1 = hl[1] % bdz->r + bdz->r;
-    h2 = hl[2] % bdz->r + (bdz->r << 1);
-    AddEdge(graph, h0, h1, h2);
-  }
-  cycles = GenerateQueue(bdz->m, bdz->n, queue, graph);
-  return cycles == 0;
-}
-
-void MPHTable::Assigning(TriGraph* graph, Queue* queue);
-void MPHTable::Ranking(TriGraph* graph, Queue* queue);
-cmph_uint32 MPHTable::Search(const StringPiece& key);
-cmph_uint32 MPHTable::Rank(const StringPiece& key);

cxxmph/trigraph.cc

@@ -1,18 +1,22 @@
+#include <limits>
+
 #include "trigraph.h"
 
+using std::vector;
+
 namespace {
-static const cmph_uint8 kInvalidEdge = std::limits<cmph_uint8>::max;
+static const cmph_uint8 kInvalidEdge = std::numeric_limits<cmph_uint8>::max();
 } 
 
 TriGraph::TriGraph(cmph_uint32 nedges, cmph_uint32 nvertices)
       : nedges_(0),
-        edges_(nedges, 0),
+        edges_(nedges),
         first_edge_(nvertices, kInvalidEdge),
         vertex_degree_(nvertices, 0) { }
 
-void Trigraph::ExtractEdgesAndClear(vector<ConnectedEdge>* edges) {
+void TriGraph::ExtractEdgesAndClear(vector<ConnectedEdge>* edges) {
-  first_edge_.swap(vector<cmph_uint32>());
+  vector<cmph_uint32>().swap(first_edge_);
-  vertex_degree_.swap(vector<cmph_uint8>());
+  vector<cmph_uint8>().swap(vertex_degree_);
   nedges_ = 0;
   edges->swap(edges_);
 }

cxxmph/trigraph.h

@@ -1,5 +1,10 @@
+#include <vector>
+
+#include "../src/cmph_types.h"
+
 class TriGraph {
   struct Edge {
+    Edge() { }
     Edge(cmph_uint32 v0, cmph_uint32 v1, cmph_uint32 v2);
     cmph_uint32 vertices[3];
   };
@@ -9,13 +14,13 @@ class TriGraph {
   };
 
   TriGraph(cmph_uint32 nedges, cmph_uint32 nvertices);
-  void AddEdge(cmph_uint32 v0, cmph_uint32 v1, cmph_uint32 v2);
+  void AddEdge(const Edge& edge);
   void RemoveEdge(cmph_uint32 current_edge);
-  void ExtractEdgesAndClear(vector<ConnectedEdge>* edges);
+  void ExtractEdgesAndClear(std::vector<ConnectedEdge>* edges);
 
  private:
   cmph_uint32 nedges_;
-  vector<ConnectedEdge> edges_;
+  std::vector<ConnectedEdge> edges_;
-  vector<cmph_uint32> first_edge_;
+  std::vector<cmph_uint32> first_edge_;
-  vector<cmph_uint8> vertex_degree_;
+  std::vector<cmph_uint8> vertex_degree_;
 };