mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 19:53:45 +01:00
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
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#include <triqs/clef.hpp>
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struct Obj {
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double v; // put something in it
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Obj(double v_) : v(v_) {} // constructor
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Obj(Obj const &) = delete; // a non copyable object, to illustrate that we do NOT copy...
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// The "normal", non CLEF call operator ....
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double operator()(double x) const { return 10 * x; }
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// This macro implements properly an overload of the operator ()
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TRIQS_CLEF_IMPLEMENT_LAZY_CALL();
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// a method
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double my_method(double x) const { return 2 * x; }
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// CLEF overload
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// WARNING : the method MUST be const
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TRIQS_CLEF_IMPLEMENT_LAZY_METHOD(Obj, my_method);
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// Just to print itself nicely in the expressions
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friend std::ostream &operator<<(std::ostream &out, Obj const &x) { return out << "Obj"; }
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};
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int main() {
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Obj f(7);
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triqs::clef::placeholder<1> x_;
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triqs::clef::placeholder<2> y_;
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std::cout << "Clef expression : " << f(y_) + 2 * x_ << std::endl;
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std::cout << "Complete evaluation : " << eval(f(x_) + 2 * x_, x_ = 1) << std::endl;
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std::cout << "Partial evaluation : " << eval(f(y_) + 2 * x_, y_ = 1) << std::endl;
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std::cout << "Complete evalution : " << eval(f(y_) + 2 * x_, x_ = 3, y_ = 1) << std::endl << std::endl;
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std::cout << "Clef expression : " << f.my_method(y_) + 2 * x_ << std::endl;
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std::cout << "Complete evaluation : " << eval(f.my_method(x_) + 2 * x_, x_ = 1) << std::endl;
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std::cout << "Partial evaluation : " << eval(f.my_method(y_) + 2 * x_, y_ = 1) << std::endl;
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std::cout << "Complete evalution : " << eval(f.my_method(y_) + 2 * x_, x_ = 3, y_ = 1) << std::endl;
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}
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