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Update example in readme (#413)

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* update readme example

* Update README.md
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Lars Melchior 2022-09-28 21:31:15 +02:00 committed by GitHub
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@ -21,6 +21,30 @@ For everything else, the targets can be created manually after the dependency ha
- [CPM: An Awesome Dependency Manager for C++ with CMake](https://medium.com/swlh/cpm-an-awesome-dependency-manager-for-c-with-cmake-3c53f4376766)
- [CMake and the Future of C++ Package Management](https://ibob.github.io/blog/2020/01/13/cmake-package-management/)
## Full CMakeLists Example
```cmake
cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
# create project
project(MyProject)
# add executable
add_executable(main main.cpp)
# add dependencies
include(cmake/CPM.cmake)
CPMAddPackage("gh:fmtlib/fmt#7.1.3")
CPMAddPackage("gh:nlohmann/json@3.10.5")
CPMAddPackage("gh:catchorg/Catch2@2.5.0")
# link dependencies
target_link_libraries(main fmt::fmt nlohmann_json::nlohmann_json Catch2::Catch2)
```
See the [examples directory](https://github.com/cpm-cmake/CPM.cmake/tree/master/examples) for complete examples with source code and check [below](#snippets) or in the [wiki](https://github.com/cpm-cmake/CPM.cmake/wiki/More-Snippets) for example snippets.
## Usage
After `CPM.cmake` has been [added](#adding-cpm) to your project, the function `CPMAddPackage` can be used to fetch and configure a dependency.
@ -78,27 +102,6 @@ For using CPM.cmake projects with external package managers, such as conan or vc
In rare cases, this behaviour may be desirable by default. The function `CPMFindPackage` will try to find a local dependency via CMake's `find_package` and fallback to `CPMAddPackage`, if the dependency is not found.
## Full CMakeLists Example
```cmake
cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
# create project
project(MyProject)
# add executable
add_executable(tests tests.cpp)
# add dependencies
include(cmake/CPM.cmake)
CPMAddPackage("gh:catchorg/Catch2@2.5.0")
# link dependencies
target_link_libraries(tests Catch2)
```
See the [examples directory](https://github.com/cpm-cmake/CPM.cmake/tree/master/examples) for complete examples with source code and check [below](#snippets) or in the [wiki](https://github.com/cpm-cmake/CPM.cmake/wiki/More-Snippets) for example snippets.
## Adding CPM
To add CPM to your current project, simply add the [latest release](https://github.com/cpm-cmake/CPM.cmake/releases/latest) of `CPM.cmake` or `get_cpm.cmake` to your project's `cmake` directory.