10.3.4

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10.22

bool func(const string &s, string::size_type sz){    return s.size() <= sz;}std::cout << count_if(v.cbegin(), v.cend(), bind(func, _1, 6));

10.23
bind接受n+1个参数，n是arg_list 中参数的数目

10.24

auto check_size(string const& str, size_t sz){    return str.size() < sz;}auto result = find_if(vec.begin(), vec.end(), bind(check_size, str, _1));

10.25

#include <iostream>#include <vector>#include <string>#include <algorithm>#include <functional>using std::string; using std::vector;using namespace std::placeholders;void elimdups(vector<string> &vs){    std::sort(vs.begin(), vs.end());    vs.erase(unique(vs.begin(), vs.end()), vs.end());}bool check_size(const string &s, string::size_type sz){    return s.size() >= sz;}void biggies(vector<string> &words, vector<string>::size_type sz){    elimdups(words);    auto iter = std::stable_partition(words.begin(), words.end(), bind(check_size, _1, sz));    for_each(words.begin(), iter, [](const string &s) { std::cout << s << " "; });}int main(){    std::vector<std::string> v{        "the", "quick", "red", "fox", "jumps", "over", "the", "slow", "red", "turtle"    };    biggies(v, 4);}

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