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Combine 4 chars into one unsigned long


Combine 4 chars into one unsigned long

By : user2954780
Date : November 22 2020, 10:33 AM
With these it helps I just want to combine 4 characters into one unsigned long variable as shown below. , This should work for you:
(You just need to know the tricks)
code :
#include <stdio.h>

int main() {

    char y[16];
    unsigned long Timer ;

    y[12] = '1';
    y[13] = '0';
    y[14] = '1';
    y[15] = '1';

    Timer = y[12] - '0';  //- '0' To get the digit, here 1, and this for every digit
    Timer = (Timer * 10) + y[13] - '0';  //*10 to make place for the next digit, and this for every digit (expect the 1st one)
    Timer = (Timer * 10) + y[14] - '0';
    Timer = (Timer * 10) + y[15] - '0';

    printf("%lu" , Timer);

    return 0;

}
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error: no matching function for call to ‘get(long unsigned int*&, long unsigned int&)’ with union_set

error: no matching function for call to ‘get(long unsigned int*&, long unsigned int&)’ with union_set


By : OdinsPlasmaRifle
Date : March 29 2020, 07:55 AM
wish helps you I have just spent ~15 minute to add the missing bits to the sample code. I was gonna edit the question and leave a comment, "sadly I ran out of time to look at your actual question".
However, then it struck me that the actual question was "why does it not compile"?
code :
#include <boost/graph/use_mpi.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/distributed/dehne_gotz_min_spanning_tree.hpp>
#include <boost/graph/incremental_components.hpp>
#include <iostream>
#include <pqxx/except.hxx>
#include <pqxx/transaction_base.hxx>
#include <set>
#include <map>
#include <string>

using std::string;
using std::set;
using std::map;
using namespace pqxx;

struct foreign_key_relationship{
    string parent_table;
    string parent_column;
    string child_table;
    string child_column;

    foreign_key_relationship(){}

    foreign_key_relationship( string pt, string pc, string ct, string cc ) : parent_table( pt ), parent_column( pc ), child_table( ct ), child_column( cc ) {}

};

inline bool operator==(const foreign_key_relationship& lhs, const foreign_key_relationship& rhs)
{
    return 
        lhs.parent_table == rhs.parent_table 
        && lhs.parent_column == rhs.parent_column 
        && lhs.child_table == rhs.child_table 
        && lhs.child_column == rhs.child_column 
    ;
}

inline bool operator<(const foreign_key_relationship& lhs, const foreign_key_relationship& rhs)
{
    return 
        lhs.parent_table < rhs.parent_table 
        && lhs.parent_column < rhs.parent_column 
        && lhs.child_table < rhs.child_table 
        && lhs.child_column < rhs.child_column 
    ;
}

typedef boost::adjacency_list < boost::vecS, boost::vecS, boost::undirectedS, string, foreign_key_relationship  > relational_graph;
typedef boost::graph_traits<relational_graph>::vertex_descriptor relational_vertex;
typedef boost::graph_traits<relational_graph>::vertices_size_type relational_vertex_index;
typedef boost::graph_traits<relational_graph>::edge_descriptor relational_edge;
typedef relational_vertex_index* relational_rank;
typedef relational_vertex* relational_parent;

void libpqxx_error( const pqxx_exception &e ){
    std::cerr << "*** Caught pqxx_exception:\n";
    std::cerr << e.base().what() << "\n";
    const sql_error *s=dynamic_cast<const sql_error*>(&e.base());
    if (s) std::cerr << "Query was: " << s->query() << "\n";
}

void connect_relational_vertices( map< foreign_key_relationship, relational_edge > &table_edges, result &foreign_keys, set<string> &tables_to_connect, map< string, relational_vertex > &table_vertices, relational_graph &rg, boost::disjoint_sets<relational_rank, relational_parent> &ds ){
    for( unsigned i=0; i<foreign_keys.size(); i++ ){
        foreign_key_relationship this_relationship(
            foreign_keys[i]["parent_table"].c_str(),
            foreign_keys[i]["parent_column"].c_str(),
            foreign_keys[i]["child_table"].c_str(),
            foreign_keys[i]["child_column"].c_str()
        );
        if( !table_edges.count( this_relationship ) && tables_to_connect.count( foreign_keys[i]["parent_table"].c_str() ) && tables_to_connect.count( foreign_keys[i]["child_table"].c_str() ) ){
            table_edges[ this_relationship ] = boost::add_edge(
                table_vertices[ string( foreign_keys[i]["parent_table"].c_str() ) ], 
                table_vertices[ string( foreign_keys[i]["child_table"].c_str() ) ], 
                this_relationship, 
                rg
            ).first;
            ds.union_set( table_vertices[ string( foreign_keys[i]["parent_table"].c_str() ) ], table_vertices[ string( foreign_keys[i]["child_table"].c_str() ) ] );
        }
    }
}

void add_possible_linking_vertex( result &foreign_keys, map< string, relational_vertex > &table_vertices, relational_graph &rg ){
    for( unsigned i=0; i<foreign_keys.size(); i++ ){
        if( !table_vertices.count( foreign_keys[i]["parent_table"].c_str() ) ){
            table_vertices[ foreign_keys[i]["parent_table"].c_str() ] = boost::add_vertex( foreign_keys[i]["parent_table"].c_str(), rg );
            break;
        }
        if( foreign_keys[i]["child_table"].c_str() ){
            table_vertices[ foreign_keys[i]["child_table"].c_str() ] = boost::add_vertex( foreign_keys[i]["child_table"].c_str(), rg );
            break;
        }
    }
}    

set< foreign_key_relationship > get_foreign_keys( transaction_base &t, set<string> tables_to_connect ){
    try{
        result foreign_keys = t.prepared("get_foreign_keys").exec();

        set< foreign_key_relationship > relational_routes;

        if( tables_to_connect.size() ){

            relational_graph rg;

            map< string, relational_vertex > table_vertices;
            for( string table: tables_to_connect )
                table_vertices[ table ] = boost::add_vertex( table, rg );

            std::vector<relational_vertex_index> rank( num_vertices(rg) );
            std::vector<relational_vertex> parent( num_vertices(rg) );

            boost::disjoint_sets<relational_rank, relational_parent> ds(&rank[0], &parent[0]);

            boost::initialize_incremental_components(rg, ds);
            boost::incremental_components(rg, ds);

            map< foreign_key_relationship, relational_edge > table_edges;
            for( unsigned i=0; i<foreign_keys.size(); i++ )
                connect_relational_vertices( table_edges, foreign_keys, tables_to_connect, table_vertices, rg, ds );

        }

        return relational_routes;
    }
    catch( const pqxx_exception &e ){
        libpqxx_error( e );
        set< foreign_key_relationship > relational_routes;
        return relational_routes;
    }
}

int main()
{
    relational_graph rg;
    map<foreign_key_relationship, relational_edge> table_edges;
    pqxx::result data;
    set<string> tables { "foo", "bar" };
    map<string, relational_vertex> table_vertices;
    boost::disjoint_sets<relational_rank, relational_parent> ds(relational_rank{}, relational_parent{});

    connect_relational_vertices(table_edges, data, tables, table_vertices, rg, ds);
}
Printed unsigned chars as hex are too long

Printed unsigned chars as hex are too long


By : user3239507
Date : March 29 2020, 07:55 AM
will be helpful for those in need Lets assume I have this very simple example:
code :
for (const char & v: bytes)
for (const unsigned char & v: bytes)
for (auto const& v: bytes)
for (auto v: bytes) // since it's only a char copying might be better
Undefined reference to crcsum(unsigned char const*, unsigned long, unsigned short)

Undefined reference to crcsum(unsigned char const*, unsigned long, unsigned short)


By : user3864139
Date : March 29 2020, 07:55 AM
I hope this helps you . Did you add crc.c into your arduino project?
Either wrap your include of crc.h with extern "C" or rename the crc.c into crc.ino:
code :
extern "C" {
    #include "crc.h"
}

void setup() {
    crcsum((const unsigned char*)"0123456789", 50000, 4);  
}
error: invalid conversion from 'DWORD {aka long unsigned int}' to 'PDWORD {aka long unsigned int*}' [-fpermissive]| how

error: invalid conversion from 'DWORD {aka long unsigned int}' to 'PDWORD {aka long unsigned int*}' [-fpermissive]| how


By : SThirumalai
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The compiler is generally right in its messages, and you should also read its warnings. You code is actually full of silly little mistakes.
code :
    if(clock() - GameAvailTMR > 100);
GetWindowThreadProcessId( hGameWindow, dwProcID);
Intel code coverage -> undefined reference to `std::string::_S_compare(unsigned long, unsigned long)

Intel code coverage -> undefined reference to `std::string::_S_compare(unsigned long, unsigned long)


By : PureMilllk
Date : March 29 2020, 07:55 AM
it helps some times I am using the intel compiler version 15.0.3 20150407 and 4.4.7 20120313 (Red Hat 4.4.7-17).
After updating to gcc 4.8.2 20140120 it is working fine. In the old gcc version the required function is not provided.
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