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what's wrong [message #8187]

Thu, 15 February 2007 09:56

Ulti
Messages: 108
Registered: September 2006

Experienced Member

void App::ExcelIt()
{
Vector<byte> s;
int32 val;
s.Add(0x0);s.Add(0x0);
s.Add(0x0);s.Add(0x01);
EndianRW::Endian::Read(s,val,0,false);
PromptOK(AsString(val));
}

namespace EndianRW
{
using namespace Upp;
struct Endian
{
template<typename Type>
static void Read(const Vector<byte>&from,Type& retVal,int32 pos=0,int32 bytes=0,bool LE=true)
{
retVal=Type(0);
if(0==bytes) bytes=sizeof(Type);
for(int32 i=0;i<bytes;++i)
{
retVal|=(LE?(((Type)((byte)from[pos+i]))<<8*i) Sad

((Type)((byte)from[pos+i]))<<8*(bytes-i-1)));
}
}
};
}

MSC7.1 windowsXP
Error messages:
d:\Ulti\MyApps\OPath\UEndian.h(15) : error C2666: 'Upp::Vector<T>::operator`[]'' : 2 overloads have similar conversions
with
[
T=Upp::byte
]
D:\Ulti\upp\uppsrc\Core\Vcont.h(32): could be 'const Upp::byte &Upp::Vector<T>::operator [](int) const'
with
[
T=Upp::byte
]
or 'built-in C++ operator[(Upp::byte , Upp::int32)'
while trying to match the argument list '(const Upp::Vector<T>, Upp::int32)'
with
[
T=Upp::byte
]
D:\Ulti\MyApps\OPath\main.cpp(128) : see reference to function template instantiation 'void EndianRW::Endian::Read<Upp::int32>(const
Upp::Vector<T> &,Type &,Upp::int32,Upp::int32,bool)' being compiled
with
[
T=Upp::byte,
Type=Upp::int32
]
d:\Ulti\MyApps\OPath\UEndian.h(15) : error C2666: 'Upp::Vector<T>::operator`[]'' : 2 overloads have similar conversions
with
[
T=Upp::byte
]
D:\Ulti\upp\uppsrc\Core\Vcont.h(32): could be 'const Upp::byte &Upp::Vector<T>::operator [](int) const'
with
[
T=Upp::byte
]
or 'built-in C++ operator[(Upp::byte , Upp::int32)'
while trying to match the argument list '(const Upp::Vector<T>, Upp::int32)'
with
[
T=Upp::byte
]
OPath: 1 file(s) built in (0:02.27), 2274 msecs / file, duration = 2284 msecs

There were errors. (0:02.70)

compiled with MINGW32 passed

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Re: what's wrong [message #8216 is a reply to message #8187]

Tue, 20 February 2007 08:44

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Well, those are these subtle C++ overloading rules that are so often broken by specific compiler implementation.

To make it clear for both compilers, typecast index to 'int'.

.... retVal|=(LE?(((Type)((byte)from[int(pos+i)])) ....

Mirek

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Re: what's wrong [message #8219 is a reply to message #8216]

Tue, 20 February 2007 12:27

Ulti
Messages: 108
Registered: September 2006

Experienced Member

thanks,I already changed pos and i to int,compiled ok.
Razz

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