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#include <iostream>
#include <string>
 
void fun1( const std::string& strParm )
{
	std::cout << "In [void fun1( const std::string& strParm )] :: " << strParm << std::endl;
}
 
 
void fun2( std::string& strParm )
{
	std::cout << "In [void fun2( std::string& strParm )] :: " << strParm << std::endl;
}
 
int main() 
{
	std::string strValue1 = "Hello ";
	std::string strValue2 = "World!!!";
 
	fun1( strValue1 + strValue2 );	// Ok
	fun2( strValue1 );				// Ok
	fun2( strValue1 + strValue2 );	// Compilation error
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:22:18: error: cannot bind non-const lvalue reference of type ‘std::__cxx11::string&’ {aka ‘std::__cxx11::basic_string<char>&’} to an rvalue of type ‘std::__cxx11::basic_string<char>’
  fun2( strValue1 + strValue2 ); // Compilation error
        ~~~~~~~~~~^~~~~~~~~~~
prog.cpp:10:6: note:   initializing argument 1 of ‘void fun2(std::__cxx11::string&)’
 void fun2( std::string& strParm )
      ^~~~

Standard output is empty