mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 03:33:50 +01:00
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>
|
|
#include <iostream>
|
|
using namespace triqs::clef;
|
|
|
|
int main() {
|
|
placeholder<0> x_;
|
|
placeholder<1> y_;
|
|
{ // with one variable
|
|
auto f = make_function(2 * x_ + 1, x_);
|
|
std::cout << f(3) << std::endl;
|
|
std::function<double(double)> F(f);
|
|
}
|
|
{ // with two variables
|
|
auto f = make_function(2 * x_ + y_ + 1, x_, y_);
|
|
std::cout << f(3, 4) << std::endl;
|
|
std::function<double(double, double)> F(f);
|
|
}
|
|
{ // Make a function partially
|
|
auto f = make_function(2 * x_ + y_ + 1, x_);
|
|
// f is a lazy expression expression with placeholder y_, returning a function...
|
|
auto f1 = eval(f, y_ = 1); // f1 is a function x-> 2*x + 2
|
|
std::cout << f1(10) << std::endl;
|
|
}
|
|
{ // Currying a function
|
|
// auto f = make_function ( make_function( 2*x_ + y_ + 1, x_), y_);
|
|
auto f = y_ >> (x_ >> 2 * x_ + y_ + 1);
|
|
// f a function y-> x-> 2x+y+1
|
|
// f(y) returns a function x-> 2x+y+1
|
|
auto g = f(3);
|
|
std::cout << g(10) << std::endl;
|
|
}
|
|
{ // playing with clef::function and std::function
|
|
triqs::clef::function<double(double, double)> f2, g2;
|
|
f2(x_, y_) = x_ + y_;
|
|
std::cout << f2(2, 3) << std::endl;
|
|
|
|
std::function<double(double, double)> sf2 = f2;
|
|
std::cout << sf2(2, 3) << std::endl;
|
|
|
|
g2(x_, y_) = x_ - y_ + f2(x_, 2 * y_);
|
|
|
|
std::function<double(double)> sf = x_ >> 2 * x_ + 1;
|
|
std::cout << sf(3) << std::endl;
|
|
}
|
|
}
|
|
|