C++14 mutable lambda and by-value and by-value init capture

by-value capture vs by-value init capture

by-value capture: type of `i` is `const int`
{
const int i = 0;
auto lambda = [i]() { };
}

by-value init capture: type of `i` is `int`
{
const int i = 0;
auto lambda = [i=i]() { }; 
}

lambda function call operator is const

error: by-value capture: type of `i` is `int`, but default lambda operator() is const member function
{
int i = 0;
auto lambda = [i]() { i = 1; }; 
}

error: by-value init capture: type of `i` is `int`, but default lambda operator() is const member function
{
const int i = 0;
auto lambda = [i=i]() { i = 1; }; 
}

making lambda function call operator mutable

error: by-value capture: type of `i` is `const int`, can't assign, even though lambda operator() is mutable member function
{
const int i = 0;
auto lambda = [i]() mutable { i = 1; };  
}

by-value capture: type of `i` is `int`, and lambda operator() is mutable member function
{
int i = 0;
auto lambda = [i]() mutable { i = 1; };  
}

by-value init capture: type of `i` is `int`, and lambda operator() is mutable member function
{
const int i = 0;
auto lambda = [i=i]() mutable { i = 1; }; 
}