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23 lines
725 B
C
23 lines
725 B
C
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// This is an include guard.
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// You could alternatively use '#pragma once'
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// See https://en.wikipedia.org/wiki/Include_guard
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#if !defined(HELLO_WORLD_H)
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#define HELLO_WORLD_H
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// Include the string header so that we have access to 'std::string'
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#include <string>
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// Declare a namespace for the function(s) we are exporting.
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// https://en.cppreference.com/w/cpp/language/namespace
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namespace hello_world {
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// Declare the 'hello()' function, which takes no arguments and returns a
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// 'std::string'. The function itself is defined in the hello_world.cpp source
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// file. Because it is inside of the 'hello_world' namespace, it's full name is
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// 'hello_world::hello()'.
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std::string hello();
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} // namespace hello_world
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#endif
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