Use nullptr.

src/shell/datalog_frontend.cpp

@@ -41,7 +41,7 @@ static stopwatch g_overall_time;
 static stopwatch g_piece_timer;
 static unsigned t_parsing = 0;
 
-static datalog::context * g_ctx = 0;
+static datalog::context * g_ctx = nullptr;
 static datalog::rule_set * g_orig_rules;
 static datalog::instruction_block * g_code;
 static datalog::execution_context * g_ectx;
@@ -257,7 +257,7 @@ unsigned read_datalog(char const * file) {
             true);
         return ERR_MEMOUT;
     }
-    register_on_timeout_proc(0);
+    register_on_timeout_proc(nullptr);
     return 0;
 }
 

src/shell/dimacs_frontend.cpp

@@ -26,7 +26,7 @@ Revision History:
 #include "util/gparams.h"
 
 extern bool          g_display_statistics;
-static sat::solver * g_solver = 0;
+static sat::solver * g_solver = nullptr;
 static clock_t       g_start_time;
 
 static void display_statistics() {
@@ -134,7 +134,7 @@ unsigned read_dimacs(char const * file_name) {
     params_ref p = gparams::get_module("sat");
     p.set_bool("produce_models", true);
     reslimit limit;
-    sat::solver solver(p, limit, 0);
+    sat::solver solver(p, limit, nullptr);
     g_solver = &solver;
 
     if (file_name) {
@@ -152,7 +152,7 @@ unsigned read_dimacs(char const * file_name) {
     
     lbool r;
     vector<sat::literal_vector> tracking_clauses;
-    sat::solver solver2(p, limit, 0);
+    sat::solver solver2(p, limit, nullptr);
     if (p.get_bool("dimacs.core", false)) {
         g_solver = &solver2;        
         sat::literal_vector assumptions;

src/shell/lp_frontend.cpp

@@ -17,7 +17,7 @@ Author:
 #include "util/gparams.h"
 #include <signal.h>
 
-static lp::lp_solver<double, double>* g_solver = 0;
+static lp::lp_solver<double, double>* g_solver = nullptr;
 
 static void display_statistics() {
     if (g_solver && g_solver->settings().print_statistics) {
@@ -95,8 +95,8 @@ void run_solver(lp_params & params, char const * mps_file_name) {
 //    #pragma omp critical (g_display_stats)
     {
         display_statistics();
-        register_on_timeout_proc(0);
-        g_solver = 0;
+        register_on_timeout_proc(nullptr);
+        g_solver = nullptr;
     }
     delete solver;
 }

src/shell/main.cpp

@@ -41,7 +41,7 @@ Revision History:
 typedef enum { IN_UNSPECIFIED, IN_SMTLIB_2, IN_DATALOG, IN_DIMACS, IN_WCNF, IN_OPB, IN_Z3_LOG, IN_MPS } input_kind;
 
 std::string         g_aux_input_file;
-char const *        g_input_file          = 0;
+char const *        g_input_file          = nullptr;
 bool                g_standard_input      = false;
 input_kind          g_input_kind          = IN_UNSPECIFIED;
 bool                g_display_statistics  = false;
@@ -113,7 +113,7 @@ void display_usage() {
    
 void parse_cmd_line_args(int argc, char ** argv) {
     int i = 1;
-    char * eq_pos = 0;
+    char * eq_pos = nullptr;
     while (i < argc) {
         char * arg = argv[i];    
 
@@ -145,7 +145,7 @@ void parse_cmd_line_args(int argc, char ** argv) {
             // allow names such as --help
             if (*opt_name == '-')
                 opt_name++;
-            char * opt_arg  = 0;
+            char * opt_arg  = nullptr;
             char * colon    = strchr(arg, ':');
             if (colon) {
                 opt_arg = colon + 1;
@@ -200,7 +200,7 @@ void parse_cmd_line_args(int argc, char ** argv) {
             else if (strcmp(opt_name, "v") == 0) {
                 if (!opt_arg)
                     error("option argument (-v:level) is missing.");
-                long lvl = strtol(opt_arg, 0, 10);
+                long lvl = strtol(opt_arg, nullptr, 10);
                 set_verbosity_level(lvl);
             }
             else if (strcmp(opt_name, "file") == 0) {
@@ -209,7 +209,7 @@ void parse_cmd_line_args(int argc, char ** argv) {
             else if (strcmp(opt_name, "T") == 0) {
                 if (!opt_arg)
                     error("option argument (-T:timeout) is missing.");
-                long tm = strtol(opt_arg, 0, 10);
+                long tm = strtol(opt_arg, nullptr, 10);
                 set_timeout(tm * 1000);
             }
             else if (strcmp(opt_name, "t") == 0) {

src/shell/opt_frontend.cpp

@@ -17,7 +17,7 @@ Copyright (c) 2015 Microsoft Corporation
 
 extern bool g_display_statistics;
 static bool g_first_interrupt = true;
-static opt::context* g_opt = 0;
+static opt::context* g_opt = nullptr;
 static double g_start_time = 0;
 static unsigned_vector g_handles;
 
@@ -115,8 +115,8 @@ static unsigned parse_opt(std::istream& in, bool is_wcnf) {
     #pragma omp critical (g_display_stats) 
     {
         display_statistics();
-        register_on_timeout_proc(0);
-        g_opt = 0;
+        register_on_timeout_proc(nullptr);
+        g_opt = nullptr;
     }    
     return 0;
 }

src/shell/smtlib_frontend.cpp

@@ -34,7 +34,7 @@ Revision History:
 
 extern bool g_display_statistics;
 static clock_t             g_start_time;
-static cmd_context *       g_cmd_context = 0;
+static cmd_context *       g_cmd_context = nullptr;
 
 static void display_statistics() {
     clock_t end_time = clock();
@@ -102,7 +102,7 @@ unsigned read_smtlib2_commands(char const * file_name) {
     #pragma omp critical (g_display_stats)
     {
         display_statistics();
-        g_cmd_context = 0;
+        g_cmd_context = nullptr;
     }
     return result ? 0 : 1;
 }