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dft_tools/doc/reference/c++/clef/assign_0.cpp
Olivier Parcollet 3fe400d34c doc : split c++ code from rst
- examples split from the rst file using a python script (split_code).
- Final result for the doc is unchanged.
- examples are compiled and tested with the other tests.
- examples' code have been clang-formatted, with triqs style.
- doc compiles much faster, and with the same options as the rest of the
  test.
- examples are added as tests, so they are run by make test, as simple C
  tests.
- done for the tutorials and the reference.
- autocompile removed (changed into triqs_example directive).
- add triqs_example :
   - make a literal include of the source code.
   - runs the compiled example
   - add, as before, the result to the source code in the doc.
- added the script split_code, used to make the changes automatically,
  maybe for later reuse. (in _tools)
2014-05-31 23:00:16 +02:00

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C++

#include "triqs/clef.hpp"
#include <iostream>
using namespace triqs::clef;
int main() {
int N = 5;
double pi = std::acos(-1);
// automatic assignment of vector
placeholder<0> k_;
std::vector<double> V(N);
make_expr(V)[k_] << cos((2 * pi * k_) / N);
// chaining them ...
placeholder<1> i_;
std::vector<std::vector<double>> W(3, std::vector<double>(N));
make_expr(W)[i_][k_] << i_ + cos((2 * pi * k_) / N);
// check result...
for (size_t u = 0; u < V.size(); ++u)
if (std::abs(V[u] - cos((2 * pi * u) / N)) > 1.e-10) throw "error!";
for (size_t w = 0; w < W.size(); ++w)
for (size_t u = 0; u < W[w].size(); ++u)
if (std::abs(W[w][u] - (w + cos((2 * pi * u) / N))) > 1.e-10) throw "error!";
}