Don't include heavy STL headers like <algorithm> in header files

This provides a considerable compilation time reduction and most
of these were just using std::copy/fill which can be replaced by
memcpy/memset, as all of their uses were applied to POD types

include/tins/bootp.h

@@ -31,7 +31,6 @@
 #define TINS_BOOTP_H
 
 #include <stdint.h>
-#include <algorithm>
 #include <vector>
 #include "pdu.h"
 #include "macros.h"
@@ -268,15 +267,14 @@ public:
      */
     template<size_t n>
     void chaddr(const HWAddress<n>& new_chaddr) {
-        // Copy the new addr
-        uint8_t* end = std::copy(
-            new_chaddr.begin(), 
-            new_chaddr.begin() + std::min(n, sizeof(bootp_.chaddr)), 
-            bootp_.chaddr
-        );
-        // Fill what's left with zeros
-        if (end < bootp_.chaddr + chaddr_type::address_size) {
-            std::fill(end, bootp_.chaddr + chaddr_type::address_size, 0);
+        size_t copy_threshold = std::min(n, sizeof(bootp_.chaddr));
+        for (size_t i = 0; i < copy_threshold; ++i) {
+            if (i < copy_threshold) {
+                bootp_.chaddr[i] = new_chaddr[i];
+            }
+            else {
+                bootp_.chaddr[i] = 0;
+            }
         }
     }
 

include/tins/internals.h

@@ -33,8 +33,6 @@
 #if TINS_IS_CXX11
 #include <type_traits>
 #endif
-
-#include <sstream>
 #include <string>
 #include <stdint.h>
 #include "constants.h"

include/tins/ip_address.h

@@ -31,7 +31,7 @@
 #define TINS_IPADDRESS_H
 
 #include <string>
-#include <iostream>
+#include <iosfwd>
 #include <stdint.h>
 #include "cxxstd.h"
 #include "macros.h"

include/tins/ipv6_address.h

@@ -32,6 +32,7 @@
 
 #include <string>
 #include <stdexcept>
+#include <iosfwd>
 #include <stdint.h>
 #include "cxxstd.h"
 #include "macros.h"
@@ -203,10 +204,7 @@ public:
      * \param addr The parameter to be written.
      * \return std::ostream& pointing to the os parameter.
      */
-    friend std::ostream& operator<<(std::ostream& os, const IPv6Address& addr) {
-        return os << addr.to_string();
-    }
-
+    friend std::ostream& operator<<(std::ostream& os, const IPv6Address& addr);
 
     /**
      * Applies a mask to an address

include/tins/memory_helpers.h

@@ -32,7 +32,6 @@
 
 #include <stdint.h>
 #include <cstring>
-#include <algorithm>
 #include <vector>
 #include "exceptions.h"
 #include "ip_address.h"
@@ -213,7 +212,7 @@ public:
         if (TINS_UNLIKELY(size_ < length)) {
             throw serialization_error();
         }
-        std::copy(start, end, buffer_);
+        std::memcpy(buffer_, &*start, length);
         skip(length);
     }
 
@@ -238,7 +237,7 @@ public:
         if (TINS_UNLIKELY(size_ < size)) {
             throw serialization_error();
         }
-        std::fill(buffer_, buffer_ + size, value);
+        std::memset(buffer_, value, size);
         skip(size);
     }
 

include/tins/pdu_cacher.h

@@ -30,7 +30,7 @@
 #ifndef TINS_PDU_CACHER_H
 #define TINS_PDU_CACHER_H
 
-#include <algorithm>
+#include <cstring>
 #include "pdu.h"
 #include "macros.h"
 
@@ -148,7 +148,7 @@ private:
         if (cached_serialization_.size() != total_sz) {
             cached_serialization_ = cached_.serialize();
         }
-        std::copy(cached_serialization_.begin(), cached_serialization_.end(), buffer);
+        std::memcpy(buffer, &*cached_serialization_.begin(), cached_serialization_.size());
     }
 
     cached_type cached_;

include/tins/pdu_option.h

@@ -33,9 +33,7 @@
 #include <vector>
 #include <iterator>
 #include <cstring>
-#include <algorithm>
 #include <string>
-#include <limits>
 #include <stdint.h>
 #include "exceptions.h"
 #include "endianness.h"
@@ -375,11 +373,7 @@ public:
             rhs.real_size_ = 0;
         }
         else {
-            std::copy(
-                rhs.data_ptr(),
-                rhs.data_ptr() + rhs.data_size(),
-                payload_.small_buffer
-            );
+            std::memcpy(payload_.small_buffer, rhs.data_ptr(), rhs.data_size());
         }
         return* this;
     }
@@ -516,16 +510,12 @@ private:
     template<typename ForwardIterator>
     void set_payload_contents(ForwardIterator start, ForwardIterator end) {
         size_t total_size = std::distance(start, end);
-        if (total_size > std::numeric_limits<uint16_t>::max()) {
+        if (total_size > 65535) {
             throw option_payload_too_large();
         }
         real_size_ = static_cast<uint16_t>(total_size);
         if (real_size_ <= small_buffer_size) {
-            std::copy(
-                start,
-                end,
-                payload_.small_buffer
-            );
+            std::memcpy(payload_.small_buffer, &*start, total_size);
         }
         else {
             payload_.big_buffer_ptr = new data_type[real_size_];

include/tins/utils.h

@@ -48,7 +48,7 @@ class NetworkInterface;
 class PacketSender;
 class PDU;
 class IPv6Address;
-template <size_t n, typename Storage>
+template <size_t n>
 class HWAddress;
 
 /**