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◆ meta()
template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
This function returns a JSON object with information about the library, including the version number and information on the platform and compiler.
- Returns
- JSON object holding version information
key | description |
compiler | Information on the used compiler. It is an object with the following keys: c++ (the used C++ standard), family (the compiler family; possible values are clang , icc , gcc , ilecpp , msvc , pgcpp , sunpro , and unknown ), and version (the compiler version). |
copyright | The copyright line for the library as string. |
name | The name of the library as string. |
platform | The used platform as string. Possible values are win32 , linux , apple , unix , and unknown . |
url | The URL of the project as string. |
version | The version of the library. It is an object with the following keys: major , minor , and patch as defined by Semantic Versioning, and string (the version string). |
- Example^^ The following code shows an example output of the meta()
- function. ^^
3 #include <nlohmann/json.hpp> 10 std::cout << std::setw(4) << json::meta() << '\n'; basic_json<> json default JSON class
static basic_json meta() returns version information on the library
Output (play with this example online):^^ {
"compiler": {
"c++": "201103",
"family": "clang",
"version": "10.0.0 (clang-1000.11.45.5)"
},
"copyright": "(C) 2013-2017 Niels Lohmann",
"name": "JSON for Modern C++",
"platform": "apple",
"url": "https://github.com/nlohmann/json",
"version": {
"major": 3,
"minor": 5,
"patch": 0,
"string": "3.5.0"
}
}
^^ The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/meta.cpp -o meta
- Exception safety^^ Strong guarantee: if an exception is thrown, there are no
- changes to any JSON value.
- Complexity^^ Constant.
- Since
- 2.1.0
Definition at line 12705 of file json.hpp.
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