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99 lines
2.2 KiB
99 lines
2.2 KiB
#pragma once
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#include <string>
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#include <chrono>
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template <typename Int>
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bool is_pow_of_two(Int n){
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return n && !(n & (n - 1));
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}
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template <typename Int>
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bool is_even(Int n){
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return (n & 1) == 0;
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}
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// calculates integer 2-log such that:
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// 2^(two_log(x)) >= x > 2^(two_log(x) - 1)
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inline unsigned int two_log(unsigned int x){
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if(x <= 1) return 0;
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return 8*sizeof(unsigned int) - unsigned(__builtin_clz(x-1));
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}
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// calculates 2^x (by squaring)
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inline unsigned int pow_two(unsigned int x){
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unsigned int base = 2;
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unsigned int y = 1;
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while(x){
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if(x & 1) y *= base;
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x >>= 1;
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base *= base;
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}
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return y;
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}
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// Makes numbers human-readable with one decimal
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// eg 2350000 becomes 2.3M
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template <typename Int>
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inline std::string human_string(Int n, std::string suffix = ""){
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static const std::string names [] = {"", "K", "M", "G"};
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unsigned int i = 0;
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Int m = 10*n;
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while(n > 1000 && i < sizeof(names)){
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n /= 1000;
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m /= 1000;
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++i;
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}
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// cast is to make the old gcc 4.4 happy (it doesn't have all overloads of to_string)
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return std::to_string(n) + "." + std::to_string(m % 10) + names[i] + suffix;
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}
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inline std::string field(std::string const & str){
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const int length = 12;
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if(str.size() > length) return str + ":\t";
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auto add = length - str.size();
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return str + ":" + std::string(add, ' ') + "\t";
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}
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// Prints a vector with brackets and commas
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// Does not work recursively!
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template <typename T>
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void print_vec(std::vector<T> const & v){
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auto it = v.begin(), end = v.end();
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std::cout << "{" << *it++;
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while(it != end) std::cout << ", " << *it++;
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std::cout << "}\n";
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}
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// RAII struct for timing
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struct timer{
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typedef std::chrono::high_resolution_clock clock;
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typedef std::chrono::time_point<clock> time;
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typedef std::chrono::duration<double> seconds;
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std::string name;
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time begin;
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timer(std::string name_)
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: name(name_)
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, begin(clock::now())
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{}
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~timer(){
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time end = clock::now();
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std::cout << name << "\t" << from_dur(end - begin) << std::endl;
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}
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static double from_dur(seconds s){
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return s.count();
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}
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};
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namespace colors {
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inline std::string red(std::string s){
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return "\x1b[31m" + s + "\x1b[39m";
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}
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inline std::string green(std::string s){
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return "\x1b[32m" + s + "\x1b[39m";
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}
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}
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