Topic: i need a simple main.cpp example

i need a simple main.cpp example

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Posted By: merom_klein
Posted On: Monday, April 30, 2001 01:52 AM

Hi can you supply a main.cpp example as you did in the java version main.java? i tried to create my own main.cpp but it didn't compile well: #include #include "l.hpp" #include "p.hpp" void main () { using namespace std; basic_istream x(); L lexer(x); P parser(lexer); parser.startRule(); } i get the following compilation error: C:antlrantlr-2.7.1libcppsrcmain.cpp(13) : error C2664: '__thiscall L::L(class std::basic_istream > &)' : cannot convert parameter 1 from 'class std::basic_istream > (void)' to 'class std::basic_istream > &' Context does More>>

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Re: i need a simple main.cpp example

Posted By: Ric_Klaren
Posted On: Tuesday, May 1, 2001 02:15 AM

See in the examples/cpp directory
most of these parsers contain pretty
small main functions.

For the program you list it makes not much
sense creating a basic_istream like that.
In general you use std::cin or a fstream as
input to the lexer.

e.g. the one from tinyc:


#include 	// or iostream.h depending on age of compiler
#include "TinyCLexer.hpp"
#include "TinyCParser.hpp"

int main(int argc, char** argv)
{
   try {
       TinyCLexer lexer(std::cin); // read from stdin
       TinyCParser parser(lexer);
       parser.program();
   } catch(std::exception& e) {
       std::cerr << "exception: " << e.what() << std::endl;
   }
   return 0;
}

Or a small snippet for fstream usage


#include 
#include 
...
std::ifstream file;
file.open("infile.txt");
if( ! file.is_open() )
{
   cerr << "Error opening file." << endl;
   return -1;
}
TinyCLexer lexer(file);
...
etc.

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