Error: expected primary-expression before '.' token

keko · #1 27-Mar-2009, 02:39

hello everyone,

I'm working with boost graph library, i get this compilation error and i don't know how to fix it, could anyone help me?:

error: expected primary-expression before '.' token

Here is my code :

CPP / C++ / C Code:

struct gate_level_t {
  		typedef vertex_property_tag kind;
	};

typedef property<gate_level_t, int> g_level;

struct edge_properties {
  std::string name;

  template<class Archive>
  void serialize(Archive & ar, const unsigned int version) {
      ar & name;
  }
};


typedef adjacency_list<vecS, vecS, undirectedS,g_level , edge_properties> Graph;


Graph g;


property_map<Graph, gate_level_t>::type
	noeud_level=get(g_level,g);

The error is in the last line.
I've omitted all irrelevant code.

Thanx!

L7Sqr · #2 27-Mar-2009, 04:28

Quote:

Originally Posted by keko

The error is in the last line.
I've omitted all irrelevant code.

Obviously not. The '.' character doesnt even appear in the example you provided.
Generally speaking, compilers give a best guess estimate of where your code is incorrect. If you have missed a semi-colon, for example, the compiler wont know this until some number of following lines (possibly 1 or more) - it will tell you approximately where the error. Some approximations are better than others.
It would be helpful for you to copy the exact compiler output (including line numbers and all else) and then paste your code here (+/- 10 lines from the reported error). Make sure to provide line numbers in your code for us as well.

keko · #3 27-Mar-2009, 04:37

i made a mistake, the error is actually ',' not '.'

the compiler output is :
tj39@crx557.cro.st.com{models_cpp}64 :g++ -I/sw/gnu_compil/gnu/Linux-RH-WS-3/include/boost-1_35 -L/sw/gnu_compil/gnu/Linux-RH-WS-3/lib/ -lboost_graph-gcc41-mt PTM_model4.cpp
PTM_model4.cpp:154: error: expected primary-expression before ',' token

thanx

L7Sqr · #4 27-Mar-2009, 11:23

Because

CPP / C++ / C Code:

get(g_level,g);

Resolves to (by tracing back in your code)

CPP / C++ / C Code:

get(property<gate_level_t, int>, g);

And that is not a thing, its a type of thing.
You should be able to do something like

CPP / C++ / C Code:

Graph g;
g_level gl;
... = get(gl, g);

Without much trouble.

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Error: expected primary-expression before '.' token

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