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Invalid addition of constness? Error: Cannot use char** to initialize const char**


Invalid addition of constness? Error: Cannot use char** to initialize const char**

By : user2957189
Date : November 23 2020, 01:01 AM
With these it helps This is an age-old problem, whereby intuitively you think you can "add constness", but in fact adding constness indirectly violates const-correctness.
The standard itself even has an example of it to help set people back on the correct path:
code :
#include <cassert>  

int main() {  
  char* p = 0;  

  //char const** a = &p; // not allowed, but let's pretend it is  
  char const** a = (char const**)&p; // instead force the cast to compile  

  char const* orig = "original";  
  *a = orig; // type of *a is char const*, which is the type of orig, this is allowed  

  assert(p == orig); // oops! char* points to a char const*  
}


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Error: invalid operands of types ‘const char [35]’ and ‘const char [2]’ to binary ‘operator+’

Error: invalid operands of types ‘const char [35]’ and ‘const char [2]’ to binary ‘operator+’


By : Prajeeth Vagu
Date : March 29 2020, 07:55 AM
help you fix your problem At the top of my file I have , Consider this:
code :
std::string str = "Hello " + "world"; // bad!
std::string str = "Hello " + std::string("world"); // ok
std::string str = "Hello " + "there " + std::string("world"); // no good!
std::string str = std::string("Hello ") + "there " + "world"; // ok
((std::string("Hello ") + "there ") + "world");
((string + char*) + char*)
((string) + char*)
((char* + char*) + string)
error: invalid operands of types ‘const char [8]’ and ‘const char [7]’ to binary ‘operator<<’

error: invalid operands of types ‘const char [8]’ and ‘const char [7]’ to binary ‘operator<<’


By : The Breaker
Date : March 29 2020, 07:55 AM
should help you out I am getting the following error: ,
code :
logStream("Hello, " << "world!")
logStream(std::string("Hello, ") + "world!");
logStream(std::string("Hello, ") + "world " + std::to_string(42) + "!" );
using namespace std::string_literals;
logStream("Hello, "s + "world!");
Error: invalid operands of types ‘const char*’ and ‘const char [7]’ to binary ‘operator+’

Error: invalid operands of types ‘const char*’ and ‘const char [7]’ to binary ‘operator+’


By : Farzane Mokhtari
Date : March 29 2020, 07:55 AM
hop of those help? You can't use + to concatenate an integer to a string. When you write
code :
", Y" + l
commandline += ", Y" + std::to_string(l) + " real ";
error: invalid operands of types 'const char[8]' and 'const char [17]' to binary 'operator<<'

error: invalid operands of types 'const char[8]' and 'const char [17]' to binary 'operator<<'


By : Raman Kumar
Date : March 29 2020, 07:55 AM
With these it helps The conditional operator ?: has a fairly low precedence (lower than <<), so you need to add parenthesis.
What is this error? cannot convert 'char**' to 'char*' for argument '1' to 'char* strcpy(char*, const char*)

What is this error? cannot convert 'char**' to 'char*' for argument '1' to 'char* strcpy(char*, const char*)


By : user5863282
Date : March 29 2020, 07:55 AM
I wish this helpful for you
code :
char * name[NAME_LEN];
 ^   ^  ^   ^
 |   |  |   |
 |   |  |  is an array of NAME_LEN
 |   | name
 |  pointers to
char
char name[NAME_LEN];
 ^    ^   ^
 |    |   |
 |    |  is an array of NAME_LEN
 |   name
char
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