ISO C ++禁止声明无类型的“向量”

Question

I am having an issue with arduino c and the StandardCplusplus package. I am trying to declare a vector but get the following error:

Node.h:26: error: ISO C++ forbids declaration of 'vector' with no type

Node.h:26: error: invalid use of '::'

Node.h:26: error: expected ';'before '<' token

Looking at other questions, here or here people forget the include or use std, but I have done both.

/*
 Node.h
*/
#ifndef Node_h
#define Node_h
#include "Arduino.h"
#include <StandardCplusplus.h>
#include <vector>
#include <string>
#include <iterator>
class Node
{
  public:
    Node(int size);
    ~Node();
    float bias();
    void set_bias(float);
    void print();
    void fprint(FILE *);
    float compute(std::vector<float> inputs);
    void setWeights(std::vector<float> inws);
    void set_weight(int,float);
    float dutyCycle();

  protected:
    std::vector<float> _weights;               //input weights:30
    float level;
    void init(int size);
    std::vector<int> firelog;

};

#endif

thanks

edit: I am using the arduino 1.5.5 ide compiler.

edit2: I have removed everything except the vector as per comments yielding:

/*
 Node.h
*/
#ifndef Node_h
#define Node_h

#include <vector>
class Node
{
  public:
      Node();
      ~Node();
      std::vector<int> test;
};

#endif

which still outputs the error:

In file included from Node.cpp:1:

Node.h:13: error: ISO C++ forbids declaration of 'vector' with no type

Node.h:13: error: invalid use of '::'

Node.h:13: error: expected ';' before '<' token

Answer 1

I just ran into this same issue and was able to resolve it by including StandardCplusplus.h in my main sketch .ino file, rather than in the C++ class header file that I wanted to use the vector in. So, it looks roughly like this:

/*
 Main.ino (or whatever your main sketch file is called)
*/

#include <StandardCplusplus.h>
#include "Node.h"

// ...

void setup()
{
}

void loop()
{
}

Then in Node.h:

/*
 Node.h
*/
#ifndef Node_h
#define Node_h

#include <vector>
class Node
{
  public:
      Node();
      ~Node();
      std::vector<int> test;
};

#endif

Answer 2

Have you read the documentation? From http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_cplusplus ,

Can I use C++ on the AVR?

Basically yes, C++ is supported (assuming your compiler has been configured and compiled to support it, of course). Source files ending in .cc, .cpp or .C will automatically cause the compiler frontend to invoke the C++ compiler. Alternatively, the C++ compiler could be explicitly called by the name avr-c++.

However, there's currently no support for libstdc++, the standard support library needed for a complete C++ implementation. This imposes a number of restrictions on the C++ programs that can be compiled.

Answer 3

Preprocess the file using the -E option of the compiler and removing stuff the compiler will complain about like -c and -o . Since you don't show how you try to compile the code it is impossible to advise how the invocation should look exactly. Note, that the output is bound to be large, ie, you should redirect it either to a file or pipe it to something like less .

Once the file is processed, check that the declarations in the Node class still read something like the original (what exactly the result will look like depends on the compiler). In particular verify that the std isn't magically gone (

If the line looks OK check that the <vector> header got properly included. You should be able to fine a line match #.*vector which, eg, looks like this in the preprocessed output on my machine:

# 1 "/opt/gcc-current/include/c++/4.9.0/vector" 1 3

After that line you'd expect actual declaration of the std::vector template (well, at some point; it may include other headers first). If the compiler find a different file which happens to be called vector the declarations of std::vector may have gone missing.

Another candidate may be something defining the include guard for the <vector> header. That would be before the code of the vector file whose location was found above. For example, the file /opt/gcc-current/include/c++/4.9.0/vector uses _GLIBCXX_VECTOR as include guard which is unlikely to be defined but I don't know what your headers are doing.