62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
/*
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VIM: let b:lcppflags="-std=c++2a -O2 -pthread -I."
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VIM: let b:wcppflags="/O2 /EHsc /DWIN32"
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VIM-: let b:argv=""
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*/
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#include <iostream>
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#include <exception>
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#include <chrono>
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#include <type_traits>
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#include <iomanip>
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template <typename T>
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constexpr T negabinary(T v){
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static_assert(std::is_integral_v<T>, "Only integral types expected.");
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const T base = -2;
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const T abs_base = abs(base);
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std::make_unsigned_t<T> n = 0;
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int i = 0;
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while ( v ){
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T r = v % base;
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v /= base;
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if ( r < 0){
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v +=1;
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r = abs_base - r;
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}
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n |= std::make_unsigned_t<T>(r) << i;
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++i;
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}
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return n;
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}
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int main ( void )
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{try{
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auto begin = std::chrono::high_resolution_clock::now();
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for (int i = -16; i < 17; ++i){
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std::cout << std::setbase(10) << i << " == " << std::setbase(16) << std::showbase << negabinary(i) << std::endl;
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}
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//std::cout << negabinary(2.) << std::endl;
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auto end = std::chrono::high_resolution_clock::now();
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std::chrono::duration<double> seconds = end - begin;
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std::cout << "Time: " << seconds.count() << std::endl;
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return 0;
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}
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catch ( const std::exception& e )
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{
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std::cerr << std::endl
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<< "std::exception(\"" << e.what() << "\")." << std::endl;
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return 2;
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}
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catch ( ... )
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{
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std::cerr << std::endl
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<< "unknown exception." << std::endl;
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return 1;
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}}
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