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Introduce UTF_CPP_CPLUSPLUS macro.

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Let the users set the C++ standard version they want to support.
This commit is contained in:
nemtrif 2019-06-30 13:06:11 -04:00
parent 088dd3ad77
commit b1002fd198
2 changed files with 14 additions and 2 deletions
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6
README.md
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@ -94,7 +94,11 @@ With a more modern compiler, the same operation would look like:
```
If `__cplusplus` macro points to a C++ 11 or later, the library exposes API that takes into
account C++ standard Unicode strings and move semantics. With an older compiler, it is still
possible to use the same functionality, just in a little less convenient way.
possible to use the same functionality, just in a little less convenient way
In case you do not trust the `__cplusplus` macro or, for instance, do not want to include
the C++ 11 helper functions even with a modern compiler, define `UTF_CPP_CPLUSPLUS` macro
before including `utf8.h` and assign it a value for the standard you want to use - the values are the same as for the `__cplusplus` macro. This can be also useful with compilers that are conservative in setting the `__cplusplus` macro even if they have a good support for a recent standard edition - Microsoft's Visual C++ is one example.
### Checking if a file contains valid UTF-8 text

10
source/utf8.h
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@ -31,7 +31,15 @@ DEALINGS IN THE SOFTWARE.
#include "utf8/checked.h"
#include "utf8/unchecked.h"
#if __cplusplus >= 201103L // C++ 11 or later
// Determine whether to include C++ 11 specific header
// If the user defines UTF_CPP_CPLUSPLUS, use that.
// Otherwise, trust the unreliable predefined macro __cplusplus
#if !defined UTF_CPP_CPLUSPLUS
#define UTF_CPP_CPLUSPLUS __cplusplus
#endif
#if UTF_CPP_CPLUSPLUS >= 201103L // C++ 11 or later
#include "utf8/cpp11.h"
#endif // C++ 11 or later