diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/manual.cli | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/doc/manual.cli b/doc/manual.cli index 04bed52..9f9dee6 100644 --- a/doc/manual.cli +++ b/doc/manual.cli @@ -4931,7 +4931,13 @@ The \c{libhello/config.hxx.in} file is new: As you can see, we can reference our configuration variables directly in the \c{config.hxx.in} substitutions (see \l{#module-in \c{in} Module} for details -on how this works). The rest is changed as follows: +on how this works). + +\N|With this setup, the way to export configuration information to our +library's users is to make the configuration header public and install it, +similar to how we do it for the version header.| + +The rest is changed as follows: \ # libhello/buildfile @@ -4959,9 +4965,20 @@ void say_hello (ostream& o, const string& n) } \ -\N|With this setup, the way to export configuration information to our -library's users is to make the configuration header public and install it, -similar to how we do it for the version header.| +\N|Notice that we had to replace \c{#ifdef\ LIBHELLO_FANCY} with \c{#if\ +LIBHELLO_FANCY}. If you want to continue using \c{#ifdef}, then you will need +to make the necessary arrangements yourself (the \c{in} module is a generic +preprocessor and does not provide any special treatment for \c{#define}). For +example: + +\ +#define LIBHELLO_FANCY $config.libhello.fancy$ +#if !LIBHELLO_FANCY +# undef LIBHELLO_FANCY +#endif +\ + +| Now that the macro-based version is working, let's see how we can take advantage of modern C++ features to hopefully improve on some of their |