Difficulty with std::replace

Question

I am still new to STL and wanted to replace all occurrences of ch in a string with k.

I tried the following:

std::replace (str.begin(), str.end(), "ch", "k");

But it threw this error:

no matching function for call to ‘replace(__gnu_cxx::__normal_iterator<char*,
  std::basic_string<char, std::char_traits<char>, std::allocator<char> > >,
  __gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>,
  std::allocator<char> > >, const char [2], const char [1])

How do I get replace to work in this case?

Note: I saw a similar question but in that case the OP was using "blah" and 'b' as arguments to be replaced but here both of my arguments are strings.

Answer 1

Since the definition of std::replace is

template< class It, class T >
void replace( It first, It last, const T& old_value, const T& new_value );

Reference http://en.cppreference.com/w/cpp/algorithm/replace

You must pass a char because a std::string is std::basic_string<char> and T is a char.

For example:

std::replace (str.begin(), str.end(), 'c',  'k');

To solve your problem, read: How do I replace all instances of a string with another string?