Extracting Elements

There are two methods for extracting individual element of an ntuple<>

• Use member get< N >() (also at< N >()) to return a reference to the element at position N.

  Member at< N >() has exactly the same behaviour as get< N >().

• Use the extractor >> to assign to its right-hand side the 0th element.

  As the extractor returns the ntuple<...>::remainder() (a tuple of the elements 1 through tuple_size - 1) the extractors can be chained.

ntuple< int, double, char, bool >  idcb( 1, 2.0, 'c', false );

char c;
bool b;
std::cout << ( c = idcb.get< 2 >() ) << ',';
std::cout << std::boolalpha << ( b = idcb.at< 3 >() ) << std::endl;

int i;
double d;

idcb >> i >> d;

CHECK( i = 1 && d == 2.0 && c == 'c' && !b );

Test Result: gcc34 Passed, msvc80 Passed, msvc71 Passed

Output

c,false

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