"network": { … "requires": ["openssl::ssl"] } "mygame": { … "requires": ["network", "engine"] } "engine": { … "requires": ["openssl::crypto"] } "ssl": { "libs": ["libssl"], "requires": ["crypto"] ["zlib::zlib"], } network.cps engine.cps openssl.cps ✔What is a component? 43 "network": { … "requires": ["zlib::static"] } "mygame": { … "requires": ["network", "engine"] } "static": { "libs": "libs": ["zlib.a"], }, "dynamic": { "libs": ["zlib.so"], } network.cps engine.cps zlib.cps X "engine": { … "requires": ["zlib::dynamic"] }What is a component? 44 "network": { … "requires":

bool commit(...) override; TestCalcEngine bool process(CalcEngine& engine, ...) { // ... engine.apply(...); // ... return engine.calculate(...); } Testing InjectionBloomberg 22 Dependency Injection override; bool commit(...) override; bool process(CalcEngineIntface& engine, ...) { // ... engine.apply(...); // ... return engine.calculate(...); } TestCalcEngine TestCalcEngine MOCK_METHOD(bool, execute templatestemplate bool process(CalcEngine& engine) { // ... engine.apply(rdata); rdata.data_ = "2"; // ... return engine.calculate(rdata); } struct RealCalcEngine { RealCalcEngine(.

@le�icus emptycrate.com/idocpp Why This Talk? ~2006 - I started looking at embedding scripting engine in C++ Learned about SWIG Learned that Python is wrong for embedding (Global state), chose Lua ChaiScript Header-only scripting engine designed for embedding in C++ 7 . 2Copyright Jason Turner @le�icus emptycrate.com/idocpp ChaiScript Header-only scripting engine designed for embedding in C++ Automatic deduction 7 . 2Copyright Jason Turner @le�icus emptycrate.com/idocpp ChaiScript Header-only scripting engine designed for embedding in C++ Automatic function / type deduction Native script function <-> C++

consisting in 3 packages: a matrix package, emulating some mathematical library, an engine package emulating some game engine, and a sound32 package, emulating a sound library for some 32bits systems. These Release 2.0.17 engine/1.0 matrix/1.0 sound32/1.0 if arch==x86 We will start by creating the first matrix/1.0 version: $ conan create matrix --version=1.0 Now we can check in the engine folder its recipe: recipe: class Engine(ConanFile): name = "engine" settings = "arch" def requirements(self): self.requires("matrix/[>=1.0 <2.0]") if self.settings.arch == "x86": self.requires("sound32/[>=1.0 <2.0]")

consisting in 3 packages: a matrix package, emulating some mathematical library, an engine package emulating some game engine, and a sound32 package, emulating a sound library for some 32bits systems. These Release 2.1.0 engine/1.0 matrix/1.0 sound32/1.0 if arch==x86 We will start by creating the first matrix/1.0 version: $ conan create matrix --version=1.0 Now we can check in the engine folder its recipe: recipe: class Engine(ConanFile): name = "engine" settings = "arch" def requirements(self): self.requires("matrix/[>=1.0 <2.0]") if self.settings.arch == "x86": self.requires("sound32/[>=1.0 <2.0]")

consisting in 3 packages: a matrix package, emulating some mathematical library, an engine package emulating some game engine, and a sound32 package, emulating a sound library for some 32bits systems. These of lockfiles. engine/1.0 matrix/1.0 sound32/1.0 if arch==x86 We will start by creating the first matrix/1.0 version: $ conan create matrix --version=1.0 Now we can check in the engine folder its recipe: recipe: class Engine(ConanFile): name = "engine" settings = "arch" def requirements(self): self.requires("matrix/[>=1.0 <2.0]") if self.settings.arch == "x86": self.requires("sound32/[>=1.0 <2.0]")

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consisting in 3 packages: a matrix package, emulating some mathematical library, an engine package emulating some game engine, and a sound32 package, emulating a sound library for some 32bits systems. These of lockfiles. engine/1.0 matrix/1.0 sound32/1.0 if arch==x86 We will start by creating the first matrix/1.0 version: $ conan create matrix --version=1.0 Now we can check in the engine folder its recipe: recipe: class Engine(ConanFile): name = "engine" settings = "arch" def requirements(self): self.requires("matrix/[>=1.0 <2.0]") if self.settings.arch == "x86": self.requires("sound32/[>=1.0 <2.0]")

consisting in 3 packages: a matrix package, emulating some mathematical library, an engine package emulating some game engine, and a sound32 package, emulating a sound library for some 32bits systems. These of lockfiles. engine/1.0 matrix/1.0 sound32/1.0 if arch==x86 We will start by creating the first matrix/1.0 version: $ conan create matrix --version=1.0 Now we can check in the engine folder its recipe: recipe: class Engine(ConanFile): name = "engine" settings = "arch" def requirements(self): self.requires("matrix/[>=1.0 <2.0]") if self.settings.arch == "x86": self.requires("sound32/[>=1.0 <2.0]")

consisting in 3 packages: a matrix package, emulating some mathematical library, an engine package emulating some game engine, and a sound32 package, emulating a sound library for some 32bits systems. These of lockfiles. engine/1.0 matrix/1.0 sound32/1.0 if arch==x86 We will start by creating the first matrix/1.0 version: $ conan create matrix --version=1.0 Now we can check in the engine folder its recipe: recipe: class Engine(ConanFile): name = "engine" settings = "arch" def requirements(self): self.requires("matrix/[>=1.0 <2.0]") if self.settings.arch == "x86": self.requires("sound32/[>=1.0 <2.0]")