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52 lines
1.1 KiB
52 lines
1.1 KiB
#pragma once
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#include <string>
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#include <chrono>
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inline bool is_pow_of_two(int n){
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return (n & (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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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) - __builtin_clz(x-1);
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}
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inline std::string human_string(int n){
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static const std::string names [] = {"", "K", "M", "G"};
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int i = 0;
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while(n > 1000 && i < sizeof(names)){
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n /= 1000;
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++i;
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}
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return std::to_string(n) + names[i];
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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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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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seconds elapsed = end - begin;
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std::cout << name << "\t" << elapsed.count() << std::endl;
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}
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};
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