mirror of
https://github.com/triqs/dft_tools
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edd1ff4529
A first general restructuration of the doc according to the pattern [tour|tutorial|reference]. In the reference part, objects are documented per topic. In each topic, [definition|c++|python|hdf5] (not yet implemented)
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#include <triqs/clef.hpp>
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#include <iostream>
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using namespace triqs::clef;
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int main() {
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placeholder<0> x_;
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placeholder<1> y_;
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{ // with one variable
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auto f = make_function(2 * x_ + 1, x_);
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std::cout << f(3) << std::endl;
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std::function<double(double)> F(f);
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}
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{ // with two variables
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auto f = make_function(2 * x_ + y_ + 1, x_, y_);
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std::cout << f(3, 4) << std::endl;
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std::function<double(double, double)> F(f);
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}
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{ // Make a function partially
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auto f = make_function(2 * x_ + y_ + 1, x_);
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// f is a lazy expression expression with placeholder y_, returning a function...
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auto f1 = eval(f, y_ = 1); // f1 is a function x-> 2*x + 2
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std::cout << f1(10) << std::endl;
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}
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{ // Currying a function
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// auto f = make_function ( make_function( 2*x_ + y_ + 1, x_), y_);
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auto f = y_ >> (x_ >> 2 * x_ + y_ + 1);
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// f a function y-> x-> 2x+y+1
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// f(y) returns a function x-> 2x+y+1
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auto g = f(3);
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std::cout << g(10) << std::endl;
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}
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{ // playing with clef::function and std::function
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triqs::clef::function<double(double, double)> f2, g2;
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f2(x_, y_) = x_ + y_;
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std::cout << f2(2, 3) << std::endl;
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std::function<double(double, double)> sf2 = f2;
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std::cout << sf2(2, 3) << std::endl;
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g2(x_, y_) = x_ - y_ + f2(x_, 2 * y_);
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std::function<double(double)> sf = x_ >> 2 * x_ + 1;
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std::cout << sf(3) << std::endl;
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}
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}
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