Compile Error Does Not Name A Type
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting compile error type mismatch ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join compile error type mismatch in vba the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a compile error type mismatch access vba minute: Sign up “does not name a type” error up vote 54 down vote favorite 13 I have two classes declared as below: class User { public: MyMessageBox dataMsgBox; }; class MyMessageBox { public: void sendMessage(Message *msg, User *recvr); Message receiveMessage(); error does not name a type arduino vector
Error Does Not Name A Type C++
you place an extern reference to a declaration in a .h / .hpp file before the class is defined, even when you have the actual declaration after the .h / .hpp inclusion within the .cpp file. –Owl Mar 19 at 20:01 add a comment| 6 Answers 6 active oldest votes up vote 119 down vote accepted When the compiler compiles the class User and gets to the MyMessageBox line, MyMessageBox has not yet been defined. It has no idea it exists, so cannot understand the meaning of your class member. You need to make sure MyMessageBox is defined before you use it as a member. This is solved by reversing the definition order. However, you have a cyclic dependency: if you move MyMessageBox above User, then in the definition of MyMessageBox the name User won't be defined! What you can do is forward declare User; that is, declare it but don't define it. During compilation, a type that is declared but not defined is called an incomplete type. Consider the simpler example: struct foo; // foo is *declared* to be a struct, but that struct is not yet defined struct bar { // this is okay, it's just a pointer; // we can point to something without knowing how that something is defined foo* fp; // likewise, we can form a reference to it void some_func(foo& fr); // but this would be an error, as before, because it requires a definition /* foo fooMember; */
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Error Does Not Name A Type Typedef
Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community class does not name a type c++ Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up '[Class does not name a type c++ struct name]' does not name a type in C++ up vote 2 down vote favorite I am programming a graph using a list of lists. For that, I have two classes, and each one of this classes has a pointer to another object of http://stackoverflow.com/questions/2133250/does-not-name-a-type-error the same class and a pointer to the object of the second class. Here is the code: File V.h: #ifndef VERTICEPUNT_H #define VERTICEPUNT_H #include "A.cpp" typedef char E; class V { public: E etiqueta; V* siguiente; A* primera; //<- Error: 'A' does not name a type V(); ~V(); }; #endif // VERTICEPUNT_H File V.cpp: #include "V.h" V::V() { etiqueta = ' '; siguiente = 0; primera = 0; //<- Error: 'primera' was not declared in this scope } V::~V() { delete primera; delete siguiente; } http://stackoverflow.com/questions/17333934/class-name-does-not-name-a-type-in-c File A.h: #ifndef ARISTAPUNT_H #define ARISTAPUNT_H #include "V.cpp" typedef int P; class A { public: P peso; V* vertice; A* siguiente; A(); ~A(); }; #endif // ARISTAPUNT_H A.cpp: #include "A.h" A::A() //<- Error: 'A' does not name a type { peso = 0; siguiente = 0; vertice = 0; } A::~A() // <- Error: 'A' does not name a type { delete siguiente; } How would I be able to fix that? class compiler-errors declaration share|improve this question asked Jun 27 '13 at 3:12 J-orge Mata Villalobos 24115 add a comment| 1 Answer 1 active oldest votes up vote 4 down vote accepted The message means that the class name is not in scope. V.h should not include A.cpp, it should include A.h. Same goes for A.h inclusion of V.cpp. In general, you never want to #include a CPP file - from a header or from another CPP file. Only .h header files are designed for inclusion by preprocessor. In case of circular definitions like this, you should forward-declare the class the pointer to which you are defining, and forego inclusion of that class's header: #ifndef VERTICEPUNT_H #define VERTICEPUNT_H class A; // <<== Forward declare the class. typedef char E; class V { public: E etiqueta; V* siguiente; A* primera; V(); ~V(); }; #endif // VERTICEPUNT_H share|improve this answer answered Jun 27 '13 at 3:16 dasblinkenlight 453k38489840 I tried that, and it fixes the errors. However, I get a couple of warnings, like possible problems when invoking ~V, and a inv
> Programming Questions > Compiler Error "... does not name a type" Print Go Down Pages: [1] Topic: https://forum.arduino.cc/index.php?topic=80086.0 Compiler Error "... does not name a type"(Read 3230 times) previous topic - next topic JanUlrich Newbie Posts: 4 Karma: 0[add] Compiler Error "... does not name a type" Nov 24, 2011, 09:39 am Hello folks,i tried to compile this code: Code: [Select]
struct Packet {
char header[7];
};
Packet does not p;
void setup()
{
p = Packet();
}
void loop()
{
}
Packet recNextPacket(){
return p;
}but the Compiler tells me at validation: "sketch_nov16a:0: error: 'Packet' does not name a type"Pls help!MFG bubulindo Faraday Member Posts: 4,252 Karma: 187[add] Microcontrollers 'R Us Re: Compiler Error "... does not name does not name a type" #1 Nov 24, 2011, 09:45 am Last Edit: Nov 24, 2011, 09:47 am by bubulindoReason: 1 Code: [Select]
struct Packet {
char header[7];
};
struct Packet p;
Or: Code: [Select]
typedef struct {
char header[7];
}Packet;
Packet p;
This... is a hobby. JanUlrich Newbie Posts: 4 Karma: 0[add] Re: Compiler Error "... does not name a type" #2 Nov 24, 2011, 10:16 am thank you very much!Problem solved.MFG JanUlrich Newbie Posts: 4 Karma: 0[add] Re: Compiler Error "... does not name a type" #3 Nov 24, 2011, 10:29 am ok I got another problem.i hope this doesnt make too much effort for you:this is the code: Code: [Select]#include "WProgram.h"
#define INT_16 int
#define UINT_16 unsigned int
#define INT long
#define UINT_32 unsigned long
UINT_32 timerInit(){
return millis();
}
UINT_32 timerDiff(UINT_32 zeitstempel){
if(millis()