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#include <string> | |
#include <iostream> | |
#include <functional> | |
using std::cout; | |
using std::endl; | |
template<typename return_type, typename ...params> | |
auto _L( return_type (*fp) (params... args)) | |
{ return [fp] (params... args) { return fp(args...); }; }; |
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auto lambda_plus = [] (auto x, auto y) { return x+y; }; | |
int z = lambda_plus(5,3); |
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auto incr = [](auto a) {return a+1;}; | |
auto dbl = [](auto a) {return a*2;}; | |
auto output_decorate = [](auto a) {cout<<a<<" "<<endl; return a;}; | |
auto dbl_incr_decor = output_decorate * incr * dbl; | |
int x = dbl_incr_decor(5); | |
double y = dbl_incr_decor(.5); |
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auto triple = [](auto a) { return a*3; }; | |
cout << (triple * incr *dbl)(5) << endl; |
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auto map = [] (const auto &function, const auto &container ) | |
{ | |
auto retval = container; | |
retval.clear(); | |
for (const auto &elem : container) | |
retval.push_back(function(elem)); | |
return retval; | |
}; | |
vector<int> data {1,2,3,4}; |
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template<typename return_type, typename ...params> | |
auto _L( return_type (*fp) (params... args)) | |
{ return [fp] (params... args) { return fp(args...); }; }; |
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auto incr = [](auto a) {return a+1;}; | |
int add1(int x) { return x+1; } | |
int sub1(int x) { return x-1; } | |
auto ident = _L(add1) * _L(sub1); | |
auto ident2 = incr * _L(sub1); | |
cout << ident(1) << "," << ident2(1) << endl; |
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template<typename return_type, typename arg1_type, typename ...params> | |
auto _L1( return_type (*fp) (arg1_type x, params...args), arg1_type x) | |
{ return [fp, x] (params...args) { return fp(x,args...); }; }; | |
double mult(double x, double y) { return x*y; } | |
auto to_radians = _L1(mult,M_PI/180.0); | |
auto cos_in_degrees = _L(cos) * to_radians; | |
cout << cos_in_degrees(45.0) << endl; |
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template<typename ExecLambda> | |
void expect_exception( ExecLambda exec_lambda, bool expect_to_throw) | |
{ | |
bool threw; | |
decltype( exec_lambda() ) x; | |
try { | |
x = exec_lambda(); | |
threw = false; | |
} | |
catch (...) { |
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template<typename ExecLambda, typename OnThrowLambda, typename NoThrowLambda> | |
auto expect_exception( ExecLambda exec_lambda, bool expect_to_throw, | |
OnThrowLambda exc_lambda, NoThrowLambda no_exc_lambda) | |
{ | |
bool threw; | |
decltype( exec_lambda() ) x; | |
try { | |
x = exec_lambda(); | |
threw = false; |
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