Check that sf::Vertex and sfVertex are compatible types

See https://github.com/SFML/SFML/pull/3211

src/CSFML/Graphics/VertexArray.cpp

@@ -30,6 +30,9 @@
 #include <CSFML/Graphics/VertexArrayStruct.hpp>
 
 
+static_assert(sizeof(sf::Vertex) == sizeof(sfVertex));
+static_assert(alignof(sf::Vertex) == alignof(sfVertex));
+
 ////////////////////////////////////////////////////////////
 sfVertexArray* sfVertexArray_create()
 {

src/CSFML/Network/Packet.cpp

@@ -173,14 +173,14 @@ double sfPacket_readDouble(sfPacket* packet)
 void sfPacket_readString(sfPacket* packet, char* string)
 {
     assert(packet);
-    if (string)
+    assert(string);
-        *packet >> string;
+    *packet >> string;
 }
 void sfPacket_readWideString(sfPacket* packet, wchar_t* string)
 {
     assert(packet);
-    if (string)
+    assert(string);
-        *packet >> string;
+    *packet >> string;
 }
 
 
@@ -232,12 +232,12 @@ void sfPacket_writeDouble(sfPacket* packet, double value)
 void sfPacket_writeString(sfPacket* packet, const char* string)
 {
     assert(packet);
-    if (string)
+    assert(string);
-        *packet << string;
+    *packet << string;
 }
 void sfPacket_writeWideString(sfPacket* packet, const wchar_t* string)
 {
     assert(packet);
-    if (string)
+    assert(string);
-        *packet << string;
+    *packet << string;
 }