Re: Problems of template programming
"jungleman" <ustcrevolutionary@gmail.com> wrote in message
news:5ce02057-b929-4690-a416-04df4ee48d10@c13g2000vbr.googlegroups.com...
here's a template function:
template<typename _Tp>
double sum(const std::vector<_Tp>& data)
{
... ...
... ...
}
may it work? If not, How can I enable template functions like this?
First: your variable name _Tp is illegal in C or C++. Variables starting
with an underscore and followed by a capital letter are reserved for the
compiler. Tp_ would be legal however as would Tp.
Second: Did you try it? The following program outputs "5"
#include <vector>
#include <iostream>
template<typename Tp>
double sum(const std::vector<Tp>& data)
{
// Some concern about the following line. User defined
// classes/structures wouldn't be assignable to 0 like this.
Tp total = 0;
for ( auto i = data.begin(); i != data.end(); ++i )
total += *i;
return total;
}
int main(){
std::vector<int> foo;
foo.push_back( 2 );
foo.push_back( 3 );
std::cout << sum<int>( foo ) << std::endl;
}
Regards,
Jim Langston
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