mirror of
https://github.com/triqs/dft_tools
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3fd3f38446
- was not compiling on gcc (forward declaration issue). - now clearer - add a trivial print change in the mc class (to avoid trivial commit).
28 lines
975 B
C++
28 lines
975 B
C++
#include "./common.hpp"
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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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// 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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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_; triqs::clef::placeholder<2> y_;
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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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