Added checks for bad input files

[SVN r21321]

example/snippets/regex_grep_example_1.cpp

@@ -86,6 +86,7 @@ using namespace std;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_grep_example_2.cpp

@@ -83,6 +83,7 @@ using namespace std;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_grep_example_3.cpp

@@ -106,6 +106,7 @@ using namespace std;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_grep_example_4.cpp

@@ -105,6 +105,7 @@ using namespace std;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_iterator_example.cpp

@@ -71,6 +71,7 @@ bool regex_callback(const boost::match_results<std::string::const_iterator>& wha
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_merge_example.cpp

@@ -41,6 +41,7 @@ extern const char* footer_text;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_replace_example.cpp

@@ -41,6 +41,7 @@ extern const char* footer_text;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_search_example.cpp

@@ -84,6 +84,7 @@ using namespace std;
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    s.reserve(is.rdbuf()->in_avail());
    char c;
    while(is.get(c))

example/snippets/regex_split_example_2.cpp

@@ -29,6 +29,7 @@ boost::regex e("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"",
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    //
    // attempt to grow string buffer to match file size,
    // this doesn't always work...

example/snippets/regex_token_iterator_eg_2.cpp

@@ -28,6 +28,7 @@ boost::regex e("<\\s*A\\s+[^>]*href\\s*=\\s*\"([^\"]*)\"",
 void load_file(std::string& s, std::istream& is)
 {
    s.erase();
+   if(is.bad()) return;
    //
    // attempt to grow string buffer to match file size,
    // this doesn't always work...