小编Shr*_*n40的帖子

我正在使用Howard Hinnant的日期库并尝试转换std::string为date::year_month_day使用下面显示的一段代码.

#include "date.h"
#include <string>
#include <iostream>
#include <sstream>

int main()
{
  std::string d = "2016-11-23";
  std::istringstream in{d};
  date::sys_days sd;
  date::parse(in, "%F", sd);
  date::year_month_day ymd = sd;
  std::cout << ymd << '\n';
}

并收到太多抱怨的错误 ‘const class std::time_get<char>’ has no member named ‘get

In file included from convert_string_to_date.cpp:1:0:
date.h: In instantiation of ‘void date::detail::parse(std::basic_istream<_CharT, _Traits>&, const std::basic_string<CharT, Traits>&, date::local_time<Duration>&, std::basic_string<CharT, Traits>*, std::chrono::minutes*) [with CharT = char; Traits = std::char_traits<char>; Duration = std::chrono::duration<int, std::ratio<86400l, 1l> …

我下面的代码会自动舍入输入.我没有看到任何功能在任何地方围绕输入.有人可以看看吗？

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main() 
 {
     string input = "";
     int weight = 0;
     int height = 0;
     int bmi = 0;
     while (true) 
     {
         cout << "Enter weight: ";
         getline(cin, input);
         // This code converts from string to number safely.
         stringstream myStream(input);
         if (myStream >> weight)
             break;
         cout << "Invalid number, please try again" << endl;
     }
     while (true) 
     {
         cout << "Enter height: " << endl;
         getline(cin, input);
         // This code …

我在我的项目中使用这些库

\n
• 乌鸦框架
\n
• SQLPP11
\n
• SQLPP-连接器-MySQL
\n
• 霍华德·辛南特的约会
\n
• json11
\n

并使用编译我的项目

g++ -std=c++1y -I ../../date main.cpp -lpthread -lsqlpp-mysql -lmysqlclient -lboost_system -ljson11\n

直到昨天为止，每天都运行得很好。但现在我收到这个错误，

\xe2\x94\x8c\xe2\x94\x80[shravan40@Debian] - [~/Work/algorithm] - [Fri Nov 18, 18:33]\n\xe2\x94\x94\xe2\x94\x80[$] <git:(riskProfiling*)> g++ -std=c++1y -I ../../date main.cpp -lpthread -lsqlpp-mysql -lmysqlclient -lboost_system -ljson11\n/usr/bin/ld: //usr/local/lib/libsqlpp-mysql.a(connection.cpp.o): relocation R_X86_64_32 against symbol `__pthread_key_create@@GLIBC_2.2.5\' can not be used when making a shared object; recompile with -fPIC\n/usr/bin/ld: //usr/local/lib/libsqlpp-mysql.a(prepared_statement.cpp.o): relocation R_X86_64_32 against symbol `__pthread_key_create@@GLIBC_2.2.5\' can not be used when making a shared …

我有一个超边界的二维向量以及一个邻接列表.我必须找到hyperEdges[i].size()向量的联合,但我只能找到两个向量的联合.我可以对下面的代码做些什么改进呢？我想将union存储到新声明的2-D向量中connectedEdges

void find_union()
{
    connectedEdges.resize(nEdges+1);
    for(int i = 1; i <= nEdges; i++)
    {
        vector<int>::iterator it;
        connectedEdges[i].resize(nEdges+1);

        for(int j = 1; j < hyperEdges[i].size()-1; j++)
        {
            int p = hyperEdges[i][j-1];
            int q= hyperEdges[i][j];
            it = set_union(adjL[p].begin(), adjL[p].end(),adjL[q].begin(),adjL[q].end(), connectedEdges[i].begin());
        connectedEdges[i].resize(it-connectedEdges[i].begin());
        }
    }    
}

示例: {1,2,4,6,8}

{1,2,3,5,6}

{1,4,7,13,15}

这三套联盟应该是{1,2,3,4,5,6,7,8,13,15} 我的计划回归{1,2,3,4,5,6,8}