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271 lines (252 loc) · 10.9 KB
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#include <vector>
#include <algorithm>
#include <iostream>
#include <iterator>
#include <deque>
#include <list>
#include <set>
#include <cctype>
#include <string>
#include <cstring>
#include <cmath>
#include <numeric>
int main(void)
{
{// 7.7 p301
std::vector<std::string> words{"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"};
auto start = std::find(std::begin(words),
std::end(words),
"two");
auto end_iter = std::find(std::begin(words),
std::end(words),
"eight");
std::vector<std::string> words_copy{2000};
auto end_copy_iter=std::rotate_copy(start,
std::find(std::begin(words), std::end(words), "five"),
end_iter,
std::begin(words_copy));
std::copy(std::begin(words_copy),
end_copy_iter,//std::end(words_copy),
std::ostream_iterator<std::string>(std::cout, " "));
std::cout << std::endl;
}
{//7.8 std::move
std::vector<int> src{1, 2, 3, 4};
std::deque<int> dest{5, 6, 7, 8};
std::move(std::begin(src), std::end(src), std::back_inserter(dest));
std::vector<int> data{1,2,3,4,5,6,7,8};
std::move(std::begin(data)+2, std::end(data), std::begin(data));
data.erase(std::end(data)-2,std::end(data));
std::copy(std::begin(data), std::end(data), std::ostream_iterator<int>{std::cout, " "});
std::cout<< std::endl;
using Name = std::pair<std::string, std::string>;
std::vector<Name> people{Name{"Al", "Bedo"}, Name{"Ann", "Ounce"}, Name{"Jo", "King"}};
std::list<Name> folks{Name{"Stan", "Down"}, Name{"Dan", "Druff"}, Name{"Bea", "Gone"}};
std::swap_ranges(std::begin(people), std::begin(people)+2, ++std::begin(folks));
std::for_each(std::begin(people), std::end(people), [](const Name& name){std::cout << '"' << name.first << " " << name.second << "\"";});
std::cout << std::endl;
std::for_each(std::begin(folks), std::end(folks), [](const Name& name){std::cout << '"' << name.first << " " << name.second << "\"";});
std::cout << std::endl;
}
{// 7.9 remove
{
std::deque<double> samples{1.5, 2.6, 0.0, 3.1, 0.0, 0.0, 4.1, 0.0, 6.7, 0.0};
samples.erase(std::remove(std::begin(samples), std::end(samples), 0.0), std::end(samples));
std::copy(std::begin(samples), std::end(samples), std::ostream_iterator<double>{std::cout, " "});
std::cout << std::endl;
}
{
std::deque<double> samples{1.5, 2.6, 0.0, 3.1, 0.0, 0.0, 4.1, 0.0, 6.7, 0.0};
std::vector<double> edited_samples;
std::remove_copy(std::begin(samples), std::end(samples), std::back_inserter(edited_samples), 0.0);
std::copy(std::begin(edited_samples), std::end(edited_samples), std::ostream_iterator<double>{std::cout, " "});
std::cout << std::endl;
}
{
using Name = std::pair<std::string, std::string>;
std::set<Name> blacklist{Name{"Al", "Bedo"}, Name{"Ann", "Ounce"}, Name{"Jo", "King"}};
std::deque<Name> candidates{Name{"Al", "Bedo"}, Name{"Ann", "Ounce"}, Name{"Di", "Gress"}, Name{"Stan", "Down"}, Name{"Dan", "Druff"}, Name{"Bea", "Gone"}};
candidates.erase(
std::remove_if(std::begin(candidates),
std::end(candidates),
[&blacklist](const Name& name) { return blacklist.count(name);}),
std::end(candidates));
std::for_each(std::begin(candidates),
std::end(candidates),
[](const Name& name) { std::cout<<'"'<<name.first<<" " <<name.second << "\" ";});
std::cout << std::endl;
}
{
using Name = std::pair<std::string, std::string>;
std::set<Name> blacklist{Name{"Al", "Bedo"}, Name{"Ann", "Ounce"}, Name{"Jo", "King"}};
std::deque<Name> candidates{Name{"Al", "Bedo"}, Name{"Ann", "Ounce"}, Name{"Di", "Gress"}, Name{"Stan", "Down"}, Name{"Dan", "Druff"}, Name{"Bea", "Gone"}};
std::deque<Name> validated;
std::remove_copy_if(std::begin(candidates),
std::end(candidates),
std::back_inserter(validated),
[&blacklist](const Name& name) { return blacklist.count(name);});
std::for_each(std::begin(validated),
std::end(validated),
[](const Name& name) { std::cout<<'"'<<name.first<<" " <<name.second << "\" ";});
std::cout << std::endl;
}
}
{//7.10 fill
std::vector<std::string> data{12};
std::fill(std::begin(data), std::end(data), "none");
std::deque<int> values(13);
int n{2};
const int step{7};
const size_t count{3};
auto iter = std::begin(values);
while(true) {
auto to_end = std::distance(iter, std::end(values));
if(to_end<count) {
std::fill(iter, iter+to_end, n);
break;
} else {
std::fill(iter, std::end(values), n);
}
iter = std::next(iter, count);
n+=step;
}
}
{// 7.10.1 generate
{
std::string chars(30, ' ');
char ch{'a'};
int incr{};
std::generate(std::begin(chars),
std::end(chars),
[ch, &incr]{ incr+=3; return ch+(incr%26);});
std::cout<<chars<<std::endl;
}
{
std::string chars(30, ' ');
char ch{'a'};
int incr{};
std::generate_n(std::begin(chars),
chars.size()/2,
[ch, &incr]{ incr+=3; return ch+(incr%26);});
std::cout<<chars<<std::endl;
}
}
{ // 7.10.2 transform
std::vector<double> deg_C { 21.0, 30.5, 0.0, 3.2, 100.0};
{
std::vector<double> deg_F(deg_C.size());
std::transform(std::begin(deg_C),
std::end(deg_C),
std::begin(deg_F),
[](double temp){return 32.0+9.0*temp/5.0;});
std::copy(std::begin(deg_F),
std::end(deg_F),
std::ostream_iterator<double>{std::cout, " "});
std::cout<<std::endl;
}
{
std::vector<double> deg_F;
std::transform(std::begin(deg_C),
std::end(deg_C),
std::back_inserter(deg_F),
[](double temp){return 32.0+9.0*temp/5.0;});
std::copy(std::begin(deg_F),
std::end(deg_F),
std::ostream_iterator<double>{std::cout, " "});
std::cout<<std::endl;
}
{
std::transform(std::begin(deg_C),
std::end(deg_C),
std::begin(deg_C),
[](double temp){return 32.0+9.0*temp/5.0;});
std::copy(std::begin(deg_C),
std::end(deg_C),
std::ostream_iterator<double>{std::cout, " "});
std::cout<<std::endl;
}
{
std::vector<std::string> words{"one", "two", "three", "four", "five"};
std::vector<size_t> hash_values;
std::transform(std::begin(words),
std::end(words),
std::back_inserter(hash_values),
std::hash<std::string>());
std::copy(std::begin(hash_values),
std::end(hash_values),
std::ostream_iterator<size_t>{std::cout, " "});
std::cout << std::endl;
}
{//大小写转换
std::deque<std::string> names{"Stan Laurel", "Oliver Hardy", "Harold Lloyd"};
std::transform(std::begin(names),
std::end(names),
std::begin(names),
[](std::string& s){ std::transform(std::begin(s),
std::end(s),
std::begin(s),
::toupper);
return s;});
std::copy(std::begin(names), std::end(names), std::ostream_iterator<std::string>{std::cout, " "});
std::cout<<std::endl;
}
{// 六边形周长计算
using Point=std::pair<double, double>;
std::vector<Point> hexagon{{1,2}, {2,1}, {3,1}, {4,2}, {3,3}, {2,3}, {1,2}};
std::vector<double>segments;
std::transform(std::begin(hexagon),
std::end(hexagon)-1,
std::begin(hexagon)+1,
std::back_inserter(segments),
[](const Point& p1, const Point& p2){
return std::sqrt(
(p1.first-p2.first)*(p1.first-p2.first) +
(p1.second-p2.second)*(p1.second-p2.second));});
std::cout<<"Segments lengths: ";
std::copy(std::begin(segments), std::end(segments), std::ostream_iterator<double>{std::cout, " "});
std::cout<<std::endl;
std::cout<<"Hexagon perimetor: "
<< std::accumulate(std::begin(segments), std::end(segments), 0.0)
<< std::endl;
}
}
{ // 7.10.3 replace
{
std::deque<int> data{10, -5, 12, -6, 10, 8, 7, 10, 11};
std::replace(std::begin(data), std::end(data), 10, 99);
std::copy(std::begin(data), std::end(data), std::ostream_iterator<int>{std::cout, " "});
std::cout<<std::endl;
}
{
std::string password{"This is a good choice!"};
std::replace_if(std::begin(password),
std::end(password),
[](char c) { return std::isspace(c);},
'_');
std::cout<<password<<std::endl;
}
{
std::vector<std::string> words{"one", "none", "two", "three", "none", "four"};
std::vector<std::string> new_words;
std::replace_copy(std::begin(words),
std::end(words),
std::back_inserter(new_words),
std::string{"none"},
std::string{"0"});
std::copy(std::begin(new_words), std::end(new_words), std::ostream_iterator<std::string>{std::cout, " "});
std::cout<<std::endl;
}
{
std::deque<int> data {10, -5, 12, -6, 10, 8, -7, 10, 11};
std::vector<int> data_copy;
std::replace_copy_if(std::begin(data),
std::end(data),
std::back_inserter(data_copy),
[](int value){return value==10;},
99);
std::copy(std::begin(data), std::end(data), std::ostream_iterator<int>{std::cout, " "});
std::cout<<std::endl;
}
}
return 0;
}
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