RE: Help with type_id and fstream
RE: Help with type_id and fstream
- Subject: RE: Help with type_id and fstream
- From: "Luca Ciciriello" <email@hidden>
- Date: Mon, 03 Sep 2007 17:34:37 +0100
As a test I've wrote the following code embedding your function.
#include <typeinfo>
#include <iostream>
using namespace std;
enum DSPFILETYPE
{
UNSIGNED_CHAR,
SIGNED_CHAR,
UNSIGNED_SHORT,
SIGNED_SHORT,
UNSIGNED_LONG,
SIGNED_LONG,
FLOAT,
DOUBLE,
UNSIGNED_INT,
SIGNED_INT,
COMPLEX,
UNKNOWN_TYPE
};
DSPFILETYPE convType( const type_info &ti )
{
// Convert type to C DSP_FILE type
if( ti == typeid( unsigned char ) ) return UNSIGNED_CHAR;
else if( ti == typeid( signed char ) ) return SIGNED_CHAR;
else if( ti == typeid( unsigned short ) ) return UNSIGNED_SHORT;
else if( ti == typeid( signed short ) ) return SIGNED_SHORT;
else if( ti == typeid( unsigned long ) ) return UNSIGNED_LONG;
else if( ti == typeid( signed long ) ) return SIGNED_LONG;
else if( ti == typeid( float ) ) return FLOAT;
else if( ti == typeid( double ) ) return DOUBLE;
// Additional types for C++
else if( ti == typeid( unsigned int ) ) return UNSIGNED_INT;
else if( ti == typeid( signed int ) ) return SIGNED_INT;
//else if( ti == typeid( Complex ) ) return COMPLEX;
return UNKNOWN_TYPE;
}
int main(int argc, char *argv[])
{
DSPFILETYPE type = convType(typeid(int));
cout << type << endl;
return 0;
}
I've created a C++ command utility project and all works fine (build and
run).
Please check if is checked the flag "Enable C++ runtime type".
Let me know.
Luca.
From: Dale Satterfield <email@hidden>
To: email@hidden
Subject: Help with type_id and fstream
Date: Sun, 2 Sep 2007 18:18:49 -0700
I am just getting back into programming so am a bit rusty on some things,
but this just seems bizarre. I am trying to build a C++ Command Line app,
as that seems the closes to a plain
C++ program without all the user interface stuff. I am trying to include
some code from a book C++ Algorthyms for DSP. In it there is the following
function:
////////////////////////////////////////////////////////////////////////
///
//
// convType( const type_info& ti )
// Converts C++ run-time type information to C DSP_FILE
//
// Returns:
// Enumerated C DSP_FILE type (see DSPFILETYPE above)
//
////////////////////////////////////////////////////////////////////////
///
// error: ISO C++ forbids declaration of 'type_info' with no type
inline DSPFILETYPE convType( const type_info &ti )
{
// Convert type to C DSP_FILE type
if( ti == typeid( unsigned char ) ) return UNSIGNED_CHAR;
else if( ti == typeid( signed char ) ) return SIGNED_CHAR;
else if( ti == typeid( unsigned short ) ) return UNSIGNED_SHORT;
else if( ti == typeid( signed short ) ) return SIGNED_SHORT;
else if( ti == typeid( unsigned long ) ) return UNSIGNED_LONG;
else if( ti == typeid( signed long ) ) return SIGNED_LONG;
else if( ti == typeid( float ) ) return FLOAT;
else if( ti == typeid( double ) ) return DOUBLE;
// Additional types for C++
else if( ti == typeid( unsigned int ) ) return UNSIGNED_INT;
else if( ti == typeid( signed int ) ) return SIGNED_INT;
else if( ti == typeid( Complex ) ) return COMPLEX;
return UNKNOWN_TYPE;
}
This causes the compiler to complain:"error: ISO C++ forbids declaration
of 'type_info' with no type." on the line DSPFILETYPE convType(
This does not appear to be a declaration to me. In addition, in one of my
C++ books I see this exact usage. I am at a loss to figure out why.
In the original code, which was I admit written to compile under Visuall
C++, there was an include for #include <typeinfo.h> which caused the
compiler to barf, so I removed it.
Is there an equivalent that I need to include ?
I also am getting errors on the declaration fstream m_fs. it says "error:
'fstream' does not declare a type. I see this exact type of declaration in
my C++ book, and I cannot
see anything in the headers that contradict it.
I am baffled by these errors.
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