Hello,
In my test program below, I have a container of columns and want to output the column headers into a string separated by a tab. The lambda expression is looking fairly complicated so I wonder if it could be made simpler or if there's any other algorithm I should've used to put a separator between the elements?
Regards,
Pete
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include
#include
#include
class Column
{
public:
explicit Column(const std::string& str) : str_(str) {}
const std::string& getColumnText() const {return str_;}
private:
std::string str_;
};
int main()
{
using namespace boost::lambda;
using boost::lambda::_1;
std::vector<Column> cols;
cols.push_back(Column("Fred"));
cols.push_back(Column("Jim"));
cols.push_back(Column("Harry"));
const std::size_t numCols = static_cast(cols.size());
const char fieldSeparator = '\t';
std::string outputText;
std::size_t i = 1;
var_typestd::size_t::type iV(var(i));
std::for_each(cols.begin(),cols.end(),
(
var(outputText) += bind(&Column::getColumnText,_1),
if_then(iV < constant(numCols),var(outputText) += constant(fieldSeparator)),
++iV
)
);
std::cout << '[' << outputText << ']';
}
