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https://github.com/triqs/dft_tools
synced 2024-12-25 13:53:40 +01:00
41 lines
939 B
C++
41 lines
939 B
C++
#include <triqs/clef.hpp>
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#include <iostream>
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namespace tql = triqs::clef;
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int main() {
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// two placeholders
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tql::placeholder <1> x_;
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tql::placeholder <2> y_;
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// a function of one variable
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triqs::clef::function<double(double)> h;
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h(x_) = 2 + 2*x_;
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std::cout<<h(3)<<std::endl;
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// expression can be given at construction
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triqs::clef::function<double(double)> h2 ( 2 + 2*x_ ,x_);
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std::cout<<h2(3)<<std::endl;
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// two variable functions
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triqs::clef::function<double(double,double)> f,g;
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f(x_,y_) = x_ + y_;
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std::cout<<f(2,3)<<std::endl;
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// affecting a new expression to f
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f(x_,y_) = x_ + 2*y_;
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std::cout<<f(2,3)<<std::endl;
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// f can be called with lazy expressions too to form more complex expressions.
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g(x_,y_) = x_ - y_ + f(x_,2*y_);
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std::cout<<g(2,3)<<std::endl;
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// lazy function are interoperable with std::function
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std::function<double(double,double)> bf(f);
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std::cout<<bf(2,3)<<std::endl;
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}
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