libpqxx: Converting field to double throws exception

Hi,

i’m trying to get some data from a postgresql table and i’m having trouble with a conversion to double :

for (auto row : r) {
	c.date_add = row[2].as<std::string>();
	c.latitude = row[3].as<double>(); // throw Could not convert string to numeric value : '45.02564'
}

The database field have “double precision” type.

i 've work my way around the problem by doing : c.latitude = std::stod(row[3].as<std::string>()); but i’d rather get it working the proper way.

I’m wondering if the locale can be at fault here ? My default locale is french where a decimal number is in theory written with a comma (45,02564).

I’m working with postgres 11 , on windows 10 et Vs 2015