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I can no longer assign char[M][N] types into a std::vector on gcc 4.9


I can no longer assign char[M][N] types into a std::vector on gcc 4.9

By : Danial Dani
Date : November 17 2020, 11:52 AM
Hope that helps The bare minimum requirement on value types for standard containers is that they must be Erasable. For the default allocator, this translates to the requirement that given value_type *p;, p->~value_type(); must be well-formed.
If value_type is a class type, it simply invokes the destructor, and is well-formed if the destructor is not deleted and is accessible. If value_type denotes a scalar type, p->~value_type(); is also valid and a no-op (this is called a pseudo destructor call). However, if value_type is an array type, then p->~value_type(); is invalid.
code :


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Convert built in types to vector<char>

Convert built in types to vector<char>


By : user2278390
Date : March 29 2020, 07:55 AM
Does that help My TcpClient class accepts vector in its SendData method like this: , Ignoring endianess:
code :
template< typename T >
char* begin_binary(const T& obj) {return reinterpret_cast<char*>(&obj);}
template< typename T >
char* end_binary  (const T& obj) {return begin_binary(obj)+sizeof(obj);}

int num = 0x01234567;
vector<char> whatIWant( begin_binary(num), end_binary(num) );
Store data of different types into a vector<char>?

Store data of different types into a vector<char>?


By : user3372186
Date : March 29 2020, 07:55 AM
To fix the issue you can do You need an iterator that is capable of inserting at the end of the vector; .begin() and .end() are only capable of modifying existing elements. Try std::back_inserter(vc).
Assign Vector element to a char variable

Assign Vector element to a char variable


By : Babajan
Date : March 29 2020, 07:55 AM
I wish this help you I have a string like this "HappyDays". , You asked for something like this (not tested):
code :
std::string str("HappyDays");
std::vector<char> vec(str.begin(), str.end());
for (int i = 0; i < vec.size(); ++i) 
{ 
  char c = vec.at(i);
  if (c < 127 && c >=0) 
  { 
     std::cout << "character " << c << " is ASCII according to OP\n"
  }
}
std::string str("HappyDays");
for (auto c: str) 
{ 
  if (0 <= c && c <= 127) 
  { 
     std::cout << "character " << c << " is ASCII\n"
  }
}
std::string str("HappyDays");
for (auto it = str.begin(); it != str.end(); ++it) 
{ 
  char c = *it;
  if (0 <= c && c <= 127) 
  { 
     std::cout << "character " << c << " is ASCII\n"
  }
}
Assign vector to longer vector by group

Assign vector to longer vector by group


By : Pc Arev
Date : March 29 2020, 07:55 AM
seems to work fine I've been struggling to assign values to some groups in some data, but I am somewhat stuck. I've tried matching unique's and rep and other. I hope someone here can help me.
code :
df$value <- value[match(df$GRP.id,unique(df$GRP.id))];
df;
##   GRP.id group value
## 1      1     A   0.3
## 2      2     B   0.8
## 3      2     B   0.8
## 4      2     B   0.8
## 5      3     C   0.3
## 6      3     C   0.3
How to assign a vector of atomic types?

How to assign a vector of atomic types?


By : nikkyandrei
Date : March 29 2020, 07:55 AM
Hope that helps std::atomic is neither copyable or move constructible, so you might do instead:
code :
std::vector<std::atomic<bool>> myvector(8);
for (auto& b : myvector) { std::atomic_init(&b, false); }
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