Re: Creating unique temporary variables using __LINE__ or other macro
travis.downs@gmail.com wrote:
I'm trying to use a macro to create a unique temporary variable name,
such as
#define TEMP_OBJ(string) MyType obj_ <some magic here> (string);
Drop the semicolon after the macro definition.
So something like
TEMP_OBJ("foo")
would evaluate to
MyType obj_1234("foo");
Where the 1234 is needed to make it unique. Thing is, I can't find a
good way to make this unique stuff. I tried __LINE__, but I could
find a way to paste it to obj_ to make the variable name.
Any ideas? Surely there must be a common idiom for this.
I used
#define CONCAT(a, b) a ## b
#define UNIQUENAME(prefix) CONCAT(prefix, __LINE__)
Which then gets used in another macro
#define PROFILER_ENTRY() \
static MyProfiler::Entry * UNIQUENAME(ppe) = \
MyProfiler::Instance().addEntry(... /* some other stuff */
#define PROFILE_THIS PROFILER_ENTRY
...
int foo() {
PROFILE_THIS();
V
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