> A colleague of mine reprodured the same failure as me on his x86_64
> architecture. I point this because I think this is the source of my issues.
> Does your architecture 64 bits?
>
> In fact, the message "Cannot convert data." comes from the template
> function string_to_integer into the file src/backends/postgresql/common.h
> Indeed, at the point the value of static_cast<long long>(max) is -1.
> I guess this is is because of the -Wno-long-long compilation option (that
> is unfortunately no straightforward to remove).
in fact, this is not a problem of compilation option. It seems it directly
comes to the template function I previously identified ( template function
string_to_integer into the file src/backends/postgresql/common.h - see below).
Indeed, on my x86_64 architecture (but it may be different on another I guess)
the "unsigned long" type and "long long" type are both 8 bytes. Thus the code:
const T max = (std::numeric_limits<T>::max)();
static_cast<long long>(max)
With T=unsigned long, it results into a value of -1 for the max value of the
(signed) long long, resulting into the identified error since the tested value
t is not into the target range (see below).
Moreover, this template function was not in soci 2.2, what would explain why
my problems appeared with the 3.0 version.
However, I must admit I don't know yet what is the best solution to solve it
properly and make the code portable to any 64 bit architecture. Any feedback
and proposition are welcome.
Regards
HLB
-----------------------------------
template <typename T>
T string_to_integer(char const * buf)
{
long long t;
int n;
int const converted = sscanf(buf, "%lld%n", &t, &n);
if (converted == 1 && static_cast<std::size_t>(n) == strlen(buf))
{
// successfully converted to long long
// and no other characters were found in the buffer
const T max = (std::numeric_limits<T>::max)();
const T min = (std::numeric_limits<T>::min)();
if (t <= static_cast<long long>(max) &&
t >= static_cast<long long>(min))
{
return static_cast<T>(t);
}
else
{
// value of out target range
throw soci_error("string_to_integer (1) Cannot convert data.");
}
}
else
{ ...
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