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April 14th, 2026, 06:29 AM
#1
Exporting a typedef'd symbol
A 3rd-party DLL I'm compiling contains the following class (in abbreviated form):-
Code:
class __declspec(dllexport) ChordProvider
{
public:
ChordProvider () {} // <--- This gets exported okay
typedef std::map<std::string,Intervals> ChordNameToIntervals;
static ChordNameToIntervals tet12_chords; // <--- tet12_chords doesn't get exported
};
The typedef'd symbol doesn't get exported for some reason. Is that fixable?
[Edit...] I tried a few searches via Google / StackOverflow etc and the consensus seems to be that typedefs are compile time objects which should be accessible from outside the DLL without needing to get exported - but I must admit, that's not what I'm seeing here 
[Update...] Adding this line to the corresponding cpp file fixed the problem 
Code:
__declspec(dllexport) ChordProvider::ChordNameToIntervals ChordProvider::tet12_chords;
Last edited by John E; April 14th, 2026 at 01:19 PM.
"A problem well stated is a problem half solved.” - Charles F. Kettering
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April 15th, 2026, 03:14 AM
#2
Re: Exporting a typedef'd symbol
The issue is that tet12_chords is static. As you're found, statics need special handling for export.
All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!
C++23 Compiler: Microsoft VS2022 (17.6.5)
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April 15th, 2026, 03:53 AM
#3
Re: Exporting a typedef'd symbol
Thanks 2kaud - I haven't used CodeGuru for a while because for a looong time it wasn't sending people emails whenever someone replied to their post but it looks like that might be working again...woohoo!
"A problem well stated is a problem half solved.” - Charles F. Kettering
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May 5th, 2026, 07:50 PM
#4
Re: Exporting a typedef'd symbol
Just to add for clarity: the typedef itself isn't the issue since it's only a compile-time alias. The real point is that `tet12_chords` is a static data member, so it needs an explicit exported definition in the .cpp - exactly like you did.xx
Good catch
Last edited by 2kaud; May 6th, 2026 at 03:25 AM.
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