mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 11:43:47 +01:00
25 lines
744 B
C++
25 lines
744 B
C++
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#include <triqs/utility/tuple_tools.hpp>
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#include <iostream>
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int main() {
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auto t = std::make_tuple(1, 2.3, 4.3, 8);
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// a simple example : make a sum
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auto f = [](double x, double r) { return x + r; };
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auto res = triqs::tuple::fold(f, t, 0); // <-- R is int but res is a double (from f's return type).
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std::cout << res << std::endl;
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// the types of x and r may be different
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triqs::tuple::fold([](double x, std::ostream & os)->std::ostream & { return os << "|" << x; }, t, std::cout);
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// example with zip
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auto t0 = std::make_tuple(1, 2, 3, 4);
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auto t1 = std::make_tuple(1, -1, 1, -1);
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auto res2 = triqs::tuple::fold([](double x, double y, double r) { return y * x + r; }, t0, t1, 0);
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std::cout << "\n " << res2 << std::endl;
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}
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