您如何在类外部的成员函数中调用成员函数？

Question

My class is defined in my header file, and in my .cpp file I have:

bool Card::foo(const std::string &trump) const {...}

bool Card::bar(const std::string &trump) const {
     bool oof = foo(const std::string &trump); 
}

This is not working for some reason. XCode is giving an error: Expected Expression. The same goes when I try:

bool oof = Card::foo(const std::string &trump);
bool oof = foo(const std::string &trump) const;

Answer 1

Check

bool Card::foo(const std::string &trump) const {...}

bool Card::bar(const std::string &trump) const {
     bool oof = foo(trump); 
}

Any of the expression below:

bool oof = foo(const std::string &trump);
bool oof = Card::foo(const std::string &trump);
bool oof = foo(const std::string &trump) const;

would redefine the trump since

bool Card::bar(const std::string &trump) const 

has already defined it.

Answer 2

The type information is not required/allowed when calling foo (the const std::string part) because the language doesnt work this way. The function declaration will need it, but do not include the type when calling it. Look at Igor's example.