SystemC sc_uint from String Object

Question

I've started using SystemC recently and wanted to write a simple program that reads numbers from a file in the SystemC string format and converts them into sc_uint types. Somehow the simple program always fails during the conversion

The program:

#include <systemc.h>
#include <fstream>
#include <string>

int sc_main( int argc, char *argv[] ){
    ifstream in_file;
    std::string line;
    char *buffer;

    in_file.open( "ex3_2.dat", ios::in );

    while( getline( in_file, line ) ){
        sc_uint<29> x = line.c_str();
    }

    return( 0 );
}

The ex3_2.dat file

0x1234\n

The output

Error: (E403) conversion failed: character string is empty

I do not get why the conversion breaks.

c_str() should return a const char*.

Printing the String to cout shows the right value for line.

Static assignments like "0x1234" do work. Does somebody have an idea?

Have you tried printing the string? Is it what you expected? — Useless, May 21 '18 at 16:35
Yes. Printing the string shows exactly what I expected "0x1234" — mdxg, May 21 '18 at 16:37
Is there any other context around the error? It's a runtime exception rather than a compile error, right? — Useless, May 21 '18 at 16:49
No compilation works without problem. Execution starts with the normal SystemC header followed by the error. — mdxg, May 21 '18 at 16:52

score 0 · Answer 1 · answered May 22 '18 at 14:25

The following code

#include <systemc.h>
#include <fstream>
#include <string>

#include <iostream>

int sc_main( int argc, char *argv[] ){

    std::ifstream in_file;
    std::string line;

    in_file.open( "ex3_2.dat", ios::in );

    while( getline( in_file, line ) ){
        sc_uint<29> x = line.c_str();
       std::cout << "0x" << std::hex << x << '\n';
    }

    return 0;
}

with the ex3_2.dat file

compiled with the following

g++ -std=c++11 -Wall -o main.o main.cpp -lsystemc

produces

g++ --version = g++ (GCC) 7.1.0

No compiler warnings or errors are emitted. The conclusion being that the code itself is fine. Perhaps look for the errors elsewhere, what std library versions are linked etc. Hidden characters in the file? ASCII vs UTF-8? Too many possibilities to narrow it down from here.

SystemC sc_uint from String Object

1 Answers1