Update examples for changed/removed APIs, namely:

 to_string -> std::to_string
 system_time -> std::chrono

4 files changed, 14 insertions, 9 deletions

diff --git a/doc/examples/asn1.cpp b/doc/examples/asn1.cpp
index 95757ec19..141d4d5b4 100644
--- a/doc/examples/asn1.cpp
+++ b/doc/examples/asn1.cpp
@@ -121,7 +121,7 @@ void decode(BER_Decoder& decoder, u32bit level)
             if((class_tag & APPLICATION) || (class_tag & CONTEXT_SPECIFIC) ||
                (class_tag & PRIVATE))
                {
-               name = "cons [" + to_string(type_tag) + "]";
+               name = "cons [" + std::to_string(type_tag) + "]";
 
                if(class_tag & APPLICATION)
                   name += " appl";
@@ -148,7 +148,7 @@ void decode(BER_Decoder& decoder, u32bit level)
 
          Pipe pipe(((not_text) ? new Hex_Encoder : 0));
          pipe.process_msg(bits);
-         emit("[" + to_string(type_tag) + "]", level, length,
+         emit("[" + std::to_string(type_tag) + "]", level, length,
               pipe.read_all_as_string());
          }
       else if(type_tag == OBJECT_ID)
diff --git a/doc/examples/ca.cpp b/doc/examples/ca.cpp
index f5eccdde9..8be0fa527 100644
--- a/doc/examples/ca.cpp
+++ b/doc/examples/ca.cpp
@@ -56,8 +56,13 @@ int main(int argc, char* argv[])
       // (this example should be extended to show how)
 
       // now sign the request
-      X509_Time start_time(system_time());
-      X509_Time end_time(system_time() + 365 * 60 * 60 * 24);
+      auto now = std::chrono::system_clock::now();
+
+      X509_Time start_time(now);
+
+      typedef std::chrono::duration<int, std::ratio<31556926>> years;
+
+      X509_Time end_time(now + years(1));
 
       X509_Certificate new_cert = ca.sign_request(req, rng,
                                                   start_time, end_time);
diff --git a/doc/examples/gen_certs.cpp b/doc/examples/gen_certs.cpp
index 80cb5f54a..557c6f46e 100644
--- a/doc/examples/gen_certs.cpp
+++ b/doc/examples/gen_certs.cpp
@@ -71,14 +71,14 @@ void save_pair(const std::string& name,
    key_out.close();
    }
 
+typedef std::chrono::duration<int, std::ratio<31556926>> years;
+
 int main()
    {
-   const u32bit seconds_in_a_year = 31556926;
-
-   const u32bit current_time = system_time();
+   auto current_time = std::chrono::system_clock::now();
 
    X509_Time now = X509_Time(current_time);
-   X509_Time later = X509_Time(current_time + 4*seconds_in_a_year);
+   X509_Time later = X509_Time(current_time + years(4));
 
    LibraryInitializer init;
 
diff --git a/doc/examples/rsa_manykey.cpp b/doc/examples/rsa_manykey.cpp
index 4122bc8ef..cf810749a 100644
--- a/doc/examples/rsa_manykey.cpp
+++ b/doc/examples/rsa_manykey.cpp
@@ -25,7 +25,7 @@ int main()
 
       RSA_PrivateKey key(rng, j);
 
-      std::ofstream priv(("rsa/" + to_string(j) + ".pem").c_str());
+      std::ofstream priv(("rsa/" + std::to_string(j) + ".pem").c_str());
       priv << PKCS8::PEM_encode(key);
       priv.close();