mirror of
https://github.com/triqs/dft_tools
synced 2024-10-31 19:23:45 +01:00
41 lines
939 B
C++
41 lines
939 B
C++
#include <triqs/clef.hpp>
|
|
#include <iostream>
|
|
namespace tql = triqs::clef;
|
|
|
|
int main() {
|
|
// two placeholders
|
|
tql::placeholder <1> x_;
|
|
tql::placeholder <2> y_;
|
|
|
|
// a function of one variable
|
|
triqs::clef::function<double(double)> h;
|
|
h(x_) = 2 + 2*x_;
|
|
std::cout<<h(3)<<std::endl;
|
|
|
|
// expression can be given at construction
|
|
triqs::clef::function<double(double)> h2 ( 2 + 2*x_ ,x_);
|
|
std::cout<<h2(3)<<std::endl;
|
|
|
|
// two variable functions
|
|
triqs::clef::function<double(double,double)> f,g;
|
|
|
|
f(x_,y_) = x_ + y_;
|
|
|
|
std::cout<<f(2,3)<<std::endl;
|
|
|
|
// affecting a new expression to f
|
|
f(x_,y_) = x_ + 2*y_;
|
|
|
|
std::cout<<f(2,3)<<std::endl;
|
|
|
|
// f can be called with lazy expressions too to form more complex expressions.
|
|
g(x_,y_) = x_ - y_ + f(x_,2*y_);
|
|
|
|
std::cout<<g(2,3)<<std::endl;
|
|
|
|
// lazy function are interoperable with std::function
|
|
std::function<double(double,double)> bf(f);
|
|
std::cout<<bf(2,3)<<std::endl;
|
|
|
|
}
|