This question already has answers here:
How to use the <format> header
(3 answers)
Closed 2 years ago.
I want to use the new C++20 <format> header. But when I try to #include it, it apparently doesn't exist in my current stdlib.
I tried using clang++ and g++, but neither of them work.
Yes, I specified the C++ standard to be "c++2a" in the tasks.json file in VSCode.
What am I doing wrong?
You can view an overview of compiler support here: https://en.cppreference.com/w/cpp/compiler_support
According to the table, up to today (May 13 '20 at 8:07) no compiler supports P0645R10: Text formatting.
The overview specifically for MSVS can be found here: https://learn.microsoft.com/en-us/cpp/overview/visual-cpp-language-conformance?view=vs-2019 (though I didn't find <format> on their list).
Related
This question already has an answer here:
checking whether library exist via preprocessor
(1 answer)
Closed 12 months ago.
Windows doesn't seem to support arc4random. Is there a preprocessor macro I can use to identify if arc4random is supported by the platform I'm compiling for ?
https://man.openbsd.org/arc4random.3
The manual says it's from <bsd/stdlib.h>, so...
#if __has_include(<bsd/stdlib.h>)
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Why C++11 compiler support still requires a flag?
(2 answers)
Closed 8 years ago.
As in title. Will it be default or to use C++11 features we will always have to add -std=c++11?
Right now, because of this option, C++11 still feels like some extra, non-standard thing.
To specify compiler, -std=c++11 flag is used by clang, g++ and even ICC.
With g++, use -dumpspecs to generate a specs file.
Use -print-search-dirs and first line is where to place specs file.
Add the -std=c++11 option appropriate place in specs file, on the line following *cc1plus:.
This question already has answers here:
xcode library not found
(14 answers)
Adding Linker Flags in Xcode
(3 answers)
Closed 8 years ago.
In terminal, this works:
g++ -lgmp main.cpp
while this does not:
g++ main.cpp
I am using X-code as my IDE and how could I tell X-code to add the statement '-lgmp' when compiling? Thank you:)
Edit: I did according to the article providing the answer:
but I still fail:
and this is the error message:
More information:
I have to use c++98 instead of c++11 because one of my package Gurobi requires that. Do you know any solution? thank you:)
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Why does VS not define the alternative tokens for logical operators?
(5 answers)
When were the 'and' and 'or' alternative tokens introduced in C++?
(8 answers)
Closed 8 years ago.
I'm working on a C++ project on Visual Studio 2008 and I found out that and, not and or keywords are not defined.
Am I missing some configuration to enable the use of theses keywords?
AFAIK, they are part of the standard, no?
"Include the header file iso646.h, or compile with the /Za (Disable language extensions) compiler option."
MSDN Link
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
GNU C++ how to check when -std=c++0x is in effect?
What I want to do is:
#if defined(CPLUSPLUS_OXFLAG)
//do something
#else
//do something else
#endif
Now how can I capture -std=c++0x argument passed to the compiler(g++) to define my CPLUSPLUS_OXFLAG flag?
The GCC documentation states that the preprocessor symbol __GXX_EXPERIMENTAL_CXX0X__ is defined when compiling with -std=c++0x.
For GCC have a look at this:
__GXX_EXPERIMENTAL_CXX0X__
This macro is defined when compiling a C++ source file with the option -std=c++0x or -std=gnu++0x. It indicates that some features likely to be included in C++0x are available. Note that these features are experimental, and may change or be removed in future versions of GCC.
Find the reference here.
GCC defines __GXX_EXPERIMENTAL_CXX0X__ when std=c++0x is enabled.